Atmel ATmega48A Bedienungsanleitung

Features

•High Performance, Low Power Atmel®AVR® 8-Bit Microcontroller

•Advanced RISC Architecture

– 131 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General Purpose Working Registers

– Fully Static Operation

– Up to 20 MIPS Throughput at 20MHz

– On-chip 2-cycle Multiplier

•High Endurance Non-volatile Memory Segments

– 4/8/16/32KBytes of In-System Self-Programmable Flash program memory

– 256/512/512/1KBytes EEPROM

– 512/1K/1K/2KBytes Internal SRAM

– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM

– Data retention: 20 years at 85°C/100 years at 25°C(1)

– Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

– Programming Lock for Software Security

•Atmel®QTouch®library support

– Capacitive touch buttons, sliders and wheels

– QTouch and QMatrix®acquisition

– Up to 64 sense channels

•Peripheral Features

– Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode

– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture

Mode

– Real Time Counter with Separate Oscillator

– Six PWM Channels

– 8-channel 10-bit ADC in TQFP and QFN/MLF package

Temperature Measurement

– 6-channel 10-bit ADC in PDIP Package

Temperature Measurement

– Programmable Serial USART

– Master/Slave SPI Serial Interface

– Byte-oriented 2-wire Serial Interface (Philips I2C compatible)

– Programmable Watchdog Timer with Separate On-chip Oscillator

– On-chip Analog Comparator

– Interrupt and Wake-up on Pin Change

•Special Microcontroller Features

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated Oscillator

– External and Internal Interrupt Sources

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby,

and Extended Standby

•I/O and Packages

– 23 Programmable I/O Lines

– 28-pin PDIP, 32-lead TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF

•Operating Voltage:

– 1.8 - 5.5V

•Temperature Range:

–-40

°C to 85°C

•Speed Grade:

– 0 - [email protected] - 5.5V, 0 - [email protected] - 5.5.V, 0 - 20MHz @ 4.5 - 5.5V

•Power Consumption at 1MHz, 1.8V, 25°C

– Active Mode: 0.2mA

– Power-down Mode: 0.1µA

– Power-save Mode: 0.75µA (Including 32kHz RTC)

8-bit Atmel

Microcontroller

with 4/8/16/32K

Bytes In-System

Programmable

Flash

ATmega48A

ATmega48PA

ATmega88A

ATmega88PA

ATmega168A

ATmega168PA

ATmega328

ATmega328P

Rev. 8271D–AVR–05/11

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

1. Pin Configurations

Figure 1-1. Pinout ATmega48A/PA/88A/PA/168A/PA/328/P

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

GND

VCC

GND

VCC

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

ADC7

GND

AREF

ADC6

AVCC

PB5 (SCK/PCINT5)

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

(PCINT1/OC1A) PB1

(PCINT2/SS/OC1B) PB2

(PCINT3/OC2A/MOSI) PB3

(PCINT4/MISO) PB4

PD2 (INT0/PCINT18)

PD1 (TXD/PCINT17)

PD0 (RXD/PCINT16)

PC6 (RESET/PCINT14)

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

32 TQFP Top View

(PCINT14/RESET) PC6

(PCINT16/RXD) PD0

(PCINT17/TXD) PD1

(PCINT18/INT0) PD2

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

VCC

GND

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

GND

AREF

AVCC

PB5 (SCK/PCINT5)

PB4 (MISO/PCINT4)

PB3 (MOSI/OC2A/PCINT3)

PB2 (SS/OC1B/PCINT2)

PB1 (OC1A/PCINT1)

28 PDIP

32 MLF Top View

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

GND

VCC

GND

VCC

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

ADC7

GND

AREF

ADC6

AVCC

PB5 (SCK/PCINT5)

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

(PCINT1/OC1A) PB1

(PCINT2/SS/OC1B) PB2

(PCINT3/OC2A/MOSI) PB3

(PCINT4/MISO) PB4

PD2 (INT0/PCINT18)

PD1 (TXD/PCINT17)

PD0 (RXD/PCINT16)

PC6 (RESET/PCINT14)

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

NOTE: Bottom pad should be soldered to ground.

28 MLF Top View

(PCINT19/OC2B/INT1) PD3

(PCINT20/XCK/T0) PD4

VCC

GND

(PCINT6/XTAL1/TOSC1) PB6

(PCINT7/XTAL2/TOSC2) PB7

(PCINT21/OC0B/T1) PD5

(PCINT22/OC0A/AIN0) PD6

(PCINT23/AIN1) PD7

(PCINT0/CLKO/ICP1) PB0

(PCINT1/OC1A) PB1

(PCINT2/SS/OC1B) PB2

(PCINT3/OC2A/MOSI) PB3

(PCINT4/MISO) PB4

PD2 (INT0/PCINT18)

PD1 (TXD/PCINT17)

PD0 (RXD/PCINT16)

PC6 (RESET/PCINT14)

PC5 (ADC5/SCL/PCINT13)

PC4 (ADC4/SDA/PCINT12)

PC3 (ADC3/PCINT11)

PC2 (ADC2/PCINT10)

PC1 (ADC1/PCINT9)

PC0 (ADC0/PCINT8)

GND

AREF

AVCC

PB5 (SCK/PCINT5)

NOTE: Bottom pad should be soldered to ground.

Table 1-1. 32UFBGA - Pinout ATmega48A/48PA/88A/88PA/168A/168PA

123456

APD2 PD1 PC6 PC4 PC2 PC1

BPD3 PD4 PD0 PC5 PC3 PC0

CGND GND ADC7 GND

DVDD VDD AREF ADC6

EPB6 PD6 PB0 PB2 AVDD PB5

FPB7 PD5 PD7 PB1 PB3 PB4

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

1.1 Pin Descriptions

1.1.1 VCC

Digital supply voltage.

1.1.2 GND

Ground.

1.1.3 Port B (PB7:0) XTAL1/XTAL2/TOSC1/TOSC2

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Depending on the clock selection fuse settings, PB6 can be used as input to the inverting Oscil-

lator amplifier and input to the internal clock operating circuit.

Depending on the clock selection fuse settings, PB7 can be used as output from the inverting

Oscillator amplifier.

If the Internal Calibrated RC Oscillator is used as chip clock source, PB7...6 is used as

TOSC2...1 input for the Asynchronous Timer/Counter2 if the AS2 bit in ASSR is set.

The various special features of Port B are elaborated in ”Alternate Functions of Port B” on page

84 and ”System Clock and Clock Options” on page 27.

1.1.4 Port C (PC5:0)

Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

PC5...0 output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

1.1.5 PC6/RESET

If the RSTDISBL Fuse is programmed, PC6 is used as an I/O pin. Note that the electrical char-

acteristics of PC6 differ from those of the other pins of Port C.

If the RSTDISBL Fuse is unprogrammed, PC6 is used as a Reset input. A low level on this pin

for longer than the minimum pulse length will generate a Reset, even if the clock is not running.

The minimum pulse length is given in Table 29-12 on page 324. Shorter pulses are not guaran-

teed to generate a Reset.

The various special features of Port C are elaborated in ”Alternate Functions of Port C” on page

87.

1.1.6 Port D (PD7:0)

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port D output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

The various special features of Port D are elaborated in ”Alternate Functions of Port D” on page

90.

1.1.7 AVCC

AVCC is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6. It should be externally

connected to VCC, even if the ADC is not used. If the ADC is used, it should be connected to VCC

through a low-pass filter. Note that PC6...4 use digital supply voltage, VCC.

1.1.8 AREF

AREF is the analog reference pin for the A/D Converter.

1.1.9 ADC7:6 (TQFP and QFN/MLF Package Only)

In the TQFP and QFN/MLF package, ADC7:6 serve as analog inputs to the A/D converter.

These pins are powered from the analog supply and serve as 10-bit ADC channels.

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

2. Overview

The ATmega48A/PA/88A/PA/168A/PA/328/P is a low-power CMOS 8-bit microcontroller based

on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock

cycle, the ATmega48A/PA/88A/PA/168A/PA/328/P achieves throughputs approaching 1 MIPS

per MHz allowing the system designer to optimize power consumption versus processing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

PORT C (7)PORT B (8)PORT D (8)

USART 0

8bit T/C 2

16bit T/C 18bit T/C 0 A/D Conv.

Internal

Bandgap

Analog

Comp.

SPI TWI

SRAMFlash

EEPROM

Watchdog

Oscillator

Watchdog

Timer

Oscillator

Circuits /

Clock

Generation

Power

Supervision

POR / BOD &

RESET

VCC

GND

PROGRAM

LOGIC

debugWIRE

GND

AREF

AVCC

DATA B U S

ADC[6..7]PC[0..6]PB[0..7]PD[0..7]

RESET

XTAL[1..2]

CPU

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

architecture is more code efficient while achieving throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The ATmega48A/PA/88A/PA/168A/PA/328/P provides the following features: 4K/8Kbytes of In-

System Programmable Flash with Read-While-Write capabilities, 256/512/512/1Kbytes

EEPROM, 512/1K/1K/2Kbytes SRAM, 23 general purpose I/O lines, 32 general purpose work-

ing registers, three flexible Timer/Counters with compare modes, internal and external

interrupts, a serial programmable USART, a byte-oriented 2-wire Serial Interface, an SPI serial

port, a 6-channel 10-bit ADC (8 channels in TQFP and QFN/MLF packages), a programmable

Watchdog Timer with internal Oscillator, and five software selectable power saving modes. The

Idle mode stops the CPU while allowing the SRAM, Timer/Counters, USART, 2-wire Serial Inter-

face, SPI port, and interrupt system to continue functioning. The Power-down mode saves the

rupt or hardware reset. In Power-save mode, the asynchronous timer continues to run, allowing

the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduc-

tion mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize

switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is

running while the rest of the device is sleeping. This allows very fast start-up combined with low

power consumption.

Atmel®offers the QTouch®library for embedding capacitive touch buttons, sliders and wheels

functionality into AVR®microcontrollers. The patented charge-transfer signal acquisition offers

robust sensing and includes fully debounced reporting of touch keys and includes Adjacent Key

Suppression®(AKS™) technology for unambiguous detection of key events. The easy-to-use

QTouch Suite toolchain allows you to explore, develop and debug your own touch applications.

The device is manufactured using Atmel’s high density non-volatile memory technology. The

On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI

serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot pro-

gram running on the AVR core. The Boot program can use any interface to download the

application program in the Application Flash memory. Software in the Boot Flash section will

continue to run while the Application Flash section is updated, providing true Read-While-Write

operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a

monolithic chip, the Atmel ATmega48A/PA/88A/PA/168A/PA/328/P is a powerful microcontroller

that provides a highly flexible and cost effective solution to many embedded control applications.

The ATmega48A/PA/88A/PA/168A/PA/328/P AVR is supported with a full suite of program and

system development tools including: C Compilers, Macro Assemblers, Program Debugger/Sim-

ulators, In-Circuit Emulators, and Evaluation kits.

2.2 Comparison Between Processors

The ATmega48A/PA/88A/PA/168A/PA/328/P differ only in memory sizes, boot loader support,

and interrupt vector sizes. Table 2-1 summarizes the different memory and interrupt vector sizes

for the devices.

Table 2-1. Memory Size Summary

Device Flash EEPROM RAM Interrupt Vector Size

ATmega48A 4KBytes 256Bytes 512Bytes 1 instruction word/vector

ATmega48PA 4KBytes 256Bytes 512Bytes 1 instruction word/vector

ATmega88A 8KBytes 512Bytes 1KBytes 1 instruction word/vector

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

ATmega48A/PA/88A/PA/168A/PA/328/P support a real Read-While-Write Self-Programming

mechanism. There is a separate Boot Loader Section, and the SPM instruction can only execute

from there. In ATmega 48A/48PA there is no Read-While-Write support and no separate Boot

Loader Section. The SPM instruction can execute from the entire Flash.

ATmega88PA 8KBytes 512Bytes 1KBytes 1 instruction word/vector

ATmega168A 16KBytes 512Bytes 1KBytes 2 instruction words/vector

ATmega168PA 16KBytes 512Bytes 1KBytes 2 instruction words/vector

ATmega328 32KBytes 1KBytes 2KBytes 2 instruction words/vector

ATmega328P 32KBytes 1KBytes 2KBytes 2 instruction words/vector

Table 2-1. Memory Size Summary (Continued)

Device Flash EEPROM RAM Interrupt Vector Size

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

3. Resources

A comprehensive set of development tools, application notes and datasheets are available for

download on http://www.atmel.com/avr.

Note: 1.

4. Data Retention

Reliability Qualification results show that the projected data retention failure rate is much less

than 1 PPM over 20 years at 85°C or 100 years at 25°C.

5. About Code Examples

This documentation contains simple code examples that briefly show how to use various parts of

the device. These code examples assume that the part specific header file is included before

compilation. Be aware that not all C compiler vendors include bit definitions in the header files

and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen-

tation for more details.

For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI”

instructions must be replaced with instructions that allow access to extended I/O. Typically

“LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.

6. Capacitive Touch Sensing

The Atmel®QTouch®Library provides a simple to use solution to realize touch sensitive inter-

faces on most Atmel AVR®microcontrollers. The QTouch Library includes support for the Atmel

QTouch and Atmel QMatrix®acquisition methods.

Touch sensing can be added to any application by linking the appropriate Atmel QTouch Library

for the AVR Microcontroller. This is done by using a simple set of APIs to define the touch chan-

nels and sensors, and then calling the touch sensing API’s to retrieve the channel information

and determine the touch sensor states.

The QTouch Library is FREE and downloadable from the Atmel website at the following location:

www.atmel.com/qtouchlibrary. For implementation details and other information, refer to the

Atmel QTouch Library User Guide - also available for download from Atmel website.

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

7. AVR CPU Core

7.1 Overview

This section discusses the AVR core architecture in general. The main function of the CPU core

is to ensure correct program execution. The CPU must therefore be able to access memories,

perform calculations, control peripherals, and handle interrupts.

Figure 7-1. Block Diagram of the AVR Architecture

In order to maximize performance and parallelism, the AVR uses a Harvard architecture – with

separate memories and buses for program and data. Instructions in the program memory are

executed with a single level pipelining. While one instruction is being executed, the next instruc-

tion is pre-fetched from the program memory. This concept enables instructions to be executed

in every clock cycle. The program memory is In-System Reprogrammable Flash memory.

The fast-access Register File contains 32 x 8-bit general purpose working registers with a single

clock cycle access time. This allows single-cycle Arithmetic Logic Unit (ALU) operation. In a typ-

Flash

Program

Memory

Instruction

Decoder

Program

Counter

Control Lines

32 x 8

General

Purpose

Registrers

ALU

Status

and Control

I/O Lines

EEPROM

Data Bus 8-bit

Data

SRAM

Direct Addressing

Indirect Addressing

Interrupt

Unit

SPI

Unit

Watchdog

Timer

Analog

Comparator

I/O Module 2

I/O Module1

I/O Module n

8271D–AVR–05/11

ATmega48A/PA/88A/PA/168A/PA/328/P

ical ALU operation, two operands are output from the Register File, the operation is executed,

and the result is stored back in the Register File – in one clock cycle.

Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data

Space addressing – enabling efficient address calculations. One of the these address pointers

can also be used as an address pointer for look up tables in Flash program memory. These

added function registers are the 16-bit X-, Y-, and Z-register, described later in this section.

The ALU supports arithmetic and logic operations between registers or between a constant and

a register. Single register operations can also be executed in the ALU. After an arithmetic opera-

tion, the Status Register is updated to reflect information about the result of the operation.

Program flow is provided by conditional and unconditional jump and call instructions, able to

directly address the whole address space. Most AVR instructions have a single 16-bit word for-

mat. Every program memory address contains a 16- or 32-bit instruction.

Program Flash memory space is divided in two sections, the Boot Program section and the

Application Program section. Both sections have dedicated Lock bits for write and read/write

protection. The SPM instruction that writes into the Application Flash memory section must

reside in the Boot Program section.

During interrupts and subroutine calls, the return address Program Counter (PC) is stored on the

Stack. The Stack is effectively allocated in the general data SRAM, and consequently the Stack

size is only limited by the total SRAM size and the usage of the SRAM. All user programs must

initialize the SP in the Reset routine (before subroutines or interrupts are executed). The Stack

Pointer (SP) is read/write accessible in the I/O space. The data SRAM can easily be accessed

through the five different addressing modes supported in the AVR architecture.

The memory spaces in the AVR architecture are all linear and regular memory maps.

A flexible interrupt module has its control registers in the I/O space with an additional Global

Interrupt Enable bit in the Status Register. All interrupts have a separate Interrupt Vector in the

Interrupt Vector table. The interrupts have priority in accordance with their Interrupt Vector posi-

tion. The lower the Interrupt Vector address, the higher the priority.

The I/O memory space contains 64 addresses for CPU peripheral functions as Control Regis-

ters, SPI, and other I/O functions. The I/O Memory can be accessed directly, or as the Data

Space locations following those of the Register File, 0x20 - 0x5F. In addition, the

ATmega48A/PA/88A/PA/168A/PA/328/P has Extended I/O space from 0x60 - 0xFF in SRAM

where only the ST/STS/STD and LD/LDS/LDD instructions can be used.

7.2 ALU – Arithmetic Logic Unit

The high-performance AVR ALU operates in direct connection with all the 32 general purpose

working registers. Within a single clock cycle, arithmetic operations between general purpose

registers or between a register and an immediate are executed. The ALU operations are divided

into three main categories – arithmetic, logical, and bit-functions. Some implementations of the

architecture also provide a powerful multiplier supporting both signed/unsigned multiplication

and fractional format. See the “Instruction Set” section for a detailed description.

7.3 Status Register

The Status Register contains information about the result of the most recently executed arithme-

tic instruction. This information can be used for altering program flow in order to perform

conditional operations. Note that the Status Register is updated after all ALU operations, as

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