Motorola M68HC11EVBU Bedienungsanleitung

M68HC11EVBU/D

REV 3

April 1997

M68HC11EVBU

UNIVERSAL EVALUATION BOARD

USER’S MANUAL

Information contained in this document applies to

REVision (B) M68HC11EVBU Universal Evaluation Boards.

MONITOR PROGRAM

M68HC11EVBU/D 3-11

CHAPTER 3

MONITOR PROGRAM

3.1 INTRODUCTION

This chapter is a description of the monitor program. This description enables you to understand

the basic structure of the program.

3.2 PROGRAM DESCRIPTION

The BUFFALO (bit user fast friendly aid to logical operations) monitor program is supplied with

the EVBU. The EVBU monitor program is stored in the MCU internal ROM and communicates

via the MCU serial communications interface (SCI). Refer to the buf32.asm file on the EVBU

diskettes for additional information pertaining to the monitor (BUFFALO) program.

The BUFFALO monitor program consists of five parts (or sections) as follows:

1. Initialization

2. Command interpreter

3. I/O routines

4. Utility subroutines

5. Command table

3.2.1 Initialization

This part of BUFFALO contains all of the reset initialization code. In this section, internal RAM

locations are set up, and the I/O channel for the terminal is set up. To set up the terminal I/O port,

BUFFALO must determine if the terminal is connected to the SCI (as in the EVBU) or to an

external ACIA or DUART. This is accomplished by sending a sign-on message to all ports and

then waiting for you to type carriage return <CR> on whichever device is the terminal port.

When BUFFALO recognizes a carriage return from a port, that port is then used for all

subsequent terminal I/O operations. The EVBU terminal device is normally connected to the

SCI.

MONITOR PROGRAM

3-2 M68HC11EVBU/D

3.2.2 Command Interpreter

The next section of BUFFALO is the command interpreter. American Standard Code for

Information Interchange (ASCII) characters are read from the terminal into the input buffer until

a carriage return or a slash (/) is received. The command field is then parsed out of the input

buffer and placed into the command buffer. A table of commands is then searched and if a match

is found, the corresponding command module is called as a subroutine. All commands return

control back to the command interpreter upon completion of the operation.

3.2.3 I/O Routines

The I/O section of BUFFALO consists of a set of supervisor routines, and three sets of driver

routines. The supervisor routines are INIT, INPUT, and OUTPUT. These routines determine

which driver subroutine to call to perform the specific action. Each set of driver routines consists

of an initialization routine, an input routine, and an output routine. One set of drivers is for the

SCI port and these routines are called ONSCI, INSCI, and OUTSCI. The second set of drivers is

for a DUART and these routines are called ONUART, INUART, and OUTUART. The third set

of drivers is for an ACIA and these routines are called ONACIA, INACIA, and OUTACIA.

All I/O communications are controlled by three RAM locations (IODEV, EXTDEV, and

HOSTDEV). EXTDEV specifies the external device type (0=none, 1=ACIA, 2=DUART).

HOSTDEV specifies which I/O port is used for host communications (0=SCI, 1=ACIA,

3=DUARTB). IODEV instructs the supervisor routine which port/driver routine to use (0=SCI,

1=ACIA, 2=DUARTA, 3=DUARTB).

The INIT routines set up a serial transmission format of eight data bits, one stop bit, and no

parity. For the SCI, the baud rate is set to 9600 for an 8 MHz crystal (2 MHz E-clock). A

different baud rate can be achieved by modifying address location $102B (refer to MCU data

sheet, SCI baud rate selection).

The INPUT routine reads from the specified port. If a character is received, the character is

returned to accumulator A. If no character is received, a logic zero (0) is returned to accumulator

A. This routine does not wait for a character to be received before returning (that function is

performed by the INCHAR utility subroutine).

The OUTPUT routine takes the ASCII character in accumulator A and writes the character to the

specified I/O port. This routine waits until the character begins transmitting before returning.

MONITOR PROGRAM

M68HC11EVBU/D 3-33

3.2.4 Utility Subroutines

Several subroutines exist that are available for performing I/O tasks. A jump table has been set

up in ROM directly before the interrupt vectors. To use these subroutines, execute a jump to

subroutine (JSR) command to the appropriate entry in the jump table. By default, all I/O

performed with these routines are sent to the terminal port. Redirection of the I/O port is

achieved by placing the specified value (0=SCI, 1=ACIA, 2=DUARTA, 3=DUARTB) into RAM

location IODEV. Utility subroutines available to the user are listed in Table 3-1.

Table 3-1. Utility Subroutine Jump Table

Address Routine Description

$FF7C .WARMST Go to ">" prompt point (skip BUFFALO... message).

$FF7F .BPCLR Clear breakpoint table.

$FF82 .RPRINT Display user’s registers.

$FF85 .HEXBIN Convert ASCII character in A register to 4-bit binary number. Shift binary

number into SHFTREG from the right. SHFTREG is a 2-byte (4 hexadecimal

digits) buffer. If A register is not hexadecimal, location TMP1 is incremented

and SHFTREG is unchanged.

$FF88 .BUFFAR Read 4-digit hexadecimal argument from input buffer to SHFTREG.

$FF8B .TERMAR Read 4-digit hexadecimal argument from terminal device to SHFTREG.

$FF8E .CHGBYT Write value (if any) from SHFTREG+1 to memory location pointed to by X.

(Operation also applicable to EEPROM locations.)

$FF91 .READBU Read next character from INBUFF.

$FF94 .INCBUF Increment pointer into input buffer.

$FF97 .DECBUF Decrement pointer into input buffer.

$FF9A .WSKIP Read input buffer until non-whitespace character found.

$FF9D .CHKABR Monitor input for (CTRL)X, (DELETE), or (CTRL)W requests.

$FFA0 .UPCASE If character in accumulator A is lower case alpha, convert to upper case.

$FFA3 .WCHEK Test character in accumulator A and return with Z bit set if character is white

space (space, comma, tab).

$FFA6 .DCHEK Test character in accumulator A and return with Z bit set if character is

delimiter (carriage return or white space).

MONITOR PROGRAM

3-4 M68HC11EVBU/D

Table 3-1. Utility Subroutine Jump Table (continued)

Address Routine Description

$FFA9 .INIT Initialize I/O device.

$FFAC .INPUT Read I/O device.

$FFAF .OUTPUT Write I/O device.

$FFB2 .OUTLHL Convert left nibble of accumulator A contents to ASCII and output to terminal

port.

$FFB5 .OUTRHL Convert right nibble of accumulator A contents to ASCII and output to terminal

port.

$FFB8 .OUTA Output accumulator A ASCII character.

$FFBB .OUT1BY Convert binary byte at address in index register X to two ASCII characters

and output. Returns address in index register X pointing to next byte.

$FFBE .OUT1BS Convert binary byte at address in index register X to two ASCII characters

and output followed by a space. Returns address in index register X pointing

to next byte.

$FFC1 .OUT2BS Convert two consecutive binary bytes starting at address in index register X to

four ASCII characters and output followed by a space. Returns address in

index register X pointing to next byte.

$FFC4 .OUTCRL Output ASCII carriage return followed by a line feed.

$FFC7 .OUTSTR Output string of ASCII bytes pointed to by address in index register X until

character is an end of transmission ($04).

$FFCA .OUTST0 Same as OUTSTR except leading carriage return and line feed is skipped.

$FFCD .INCHAR Input ASCII character to accumulator A and echo back. This routine loops

until character is actually received.

$FFD0 .VECINIT Used during initialization to preset indirect interrupt vector area in RAM. This

routine or a similar routine should be included in a user program which is

invoked by the jump to $B600 feature of BUFFALO.

When accessing BUFFALO utility routines, always reference the routines by the applicable

address ($FF7C through $FFD0) in the jump table rather than the actual address in the

BUFFALO monitor program. Jump table addresses remain the same when a new version of

BUFFALO is developed even though the actual addresses of the routine may change. Programs

that reference routines by the jump table addresses are not required to be changed to operate on

revised versions of the BUFFALO monitor program.

MONITOR PROGRAM

M68HC11EVBU/D 3-55

3.2.5 Command Table

The command table consists of three lines for each entry. The first byte is the number of

characters in the command name. The second entry is the ASCII command name. The third entry

is the starting address of the command module. As an example:

FCB 3 3 characters in command name

FCC ’ASM’ ASCII literal command name string

FDB ASM Jump address for command module

Each command in the BUFFALO program is a individual module. Thus, to add or delete

commands, all that is required is to include a new command module or delete an existing module

and/or delete the entry in the command table. This procedure may be difficult to accomplish with

the M68HC11EVBU because the BUFFALO monitor is contained in ROM. However with the

standard M68HC11EVB, you may change commands, as this version of the BUFFALO monitor

is contained in EPROM.

3.3 INTERRUPT VECTORS

Interrupt vectors residing in MCU internal ROM are accessible as follows. Each vector is

assigned a three byte field residing in EVBU memory map locations $0000-$00FF. This is where

the monitor program expects the MCU RAM to reside. Each vector points to a three byte field

which is used as a jump table to the vector service routine. Table 3-2 lists the interrupt vectors

and associated three byte field.

Table 3-2. Interrupt Vector Jump Table

Interrupt Vector Field

Serial Communications Interface (SCI) $E0C4 – $E0C6

Serial Peripheral Interface (SPI) $E0C7 – $E0C9

Pulse Accumulator Input Edge $E0CA – $E0CC

Pulse Accumulator Overflow $E0CD – $E0CF

Timer Overflow $E0D0 – $E0D2

Timer Output Compare 5 $E0D3 – $E0D5

Timer Output Compare 4 $E0D6 – $E0D8

Timer Output Compare 3 $E0D9 – $E0DB

Timer Output Compare 2 $E0DC – $E0DE

Timer Output Compare 1 $E0DF – $E0E1

MONITOR PROGRAM

3-6 M68HC11EVBU/D

Table 3-2. Interrupt Vector Jump Table (continued)

Interrupt Vector Field

Timer Input Capture 3 $E0E2 – $E0E4

Timer Input Capture 2 $E0E5 – $E0E7

Timer Input Capture 1 $E0E8 – $E0EA

Real Time Interrupt $E0EB – $E0ED

IRQ $E0EE – $E0F0

XIRQ $E0F1 – $E0F3

Software Interrupt (SWI) $E0F4 – $E0F6

Illegal Opcode $E0F7 – $E0F9

Computer Operating Properly (COP) $E0FA – $E0FC

Clock Monitor $E0FD – $E0FF

To use vectors specified in Table 3-2, you must insert a jump extended opcode in the three byte

field of the vector required. For an example, for the IRQ vector, the following is performed:

1. Place $7E (JMP) at location $00EE.

2. Place IRQ service routine address at locations $00EF and $00F0.

3. The following is an example where the IRQ service routine starts at $0100:

$00EE 7E 01 00 JMP IRQ SERVICE

During initialization BUFFALO checks the first byte of each set of three locations. If a $7E jump

opcode is not found, BUFFALO will install a jump to a routine called STOPIT. This assures

there will be no uninitialized interrupt vectors which would cause undesirable operation during

power up and power down. If an interrupt is accidentally encountered, the STOPIT routine will

force a STOP instruction sequence to be executed. A user may replace any of the JMP STOPIT

instructions with a JMP to a user written interrupt service routine. If a reset is issued via switch

S1, BUFFALO will not overwrite these user jump instructions so they need not be re-initialized

after every reset.

OPERATING INSTRUCTIONS

M68HC11EVBU/D 4-1

CHAPTER 4

OPERATING INSTRUCTIONS

4.1 INTRODUCTION

This chapter provides the necessary information to initialize and operate the EVBU. Information

consists of the control switch description, operating limitations, command line format, monitor

commands, and operating procedures. The operating procedures consist of assembly/disassembly

and downloading descriptions and examples.

4.2 CONTROL SWITCH

Use user reset switch S1 to reset the EVBU and MCU circuits. This switch is a momentary action

pushbutton switch.

4.3 LIMITATIONS

The default baud rate for the MC68HC11 MCU SCI is 9600. using a 2 MHz E clock. You can

reset the baud rate using the memory modify (MM) command to reprogram the BAUD register in

the MCU. Or by using instructions in the user program.

The EVBU can transfer data faster than some terminal devices can receive, which at certain

times, can cause missing characters on the terminal display screen. Memory display (MD), trace

(TRACE), and help (HELP) commands may be affected by this problem. You can either ignore

the problem, switch to a slower baud rate, or use a different communications program. When

using the MD or TRACE commands, the missing character problem can be resolved by

displaying fewer address locations or tracing fewer instructions at a time, respectively.

The monitor program uses the MCU internal RAM located at $0048-$00FF. The control registers

are located at $1000-$103F. The monitor program also uses Output Compare 5 (OC5) for the

TRACE instruction, therefore TRACE cannot be used in user programs which use OC5. Since

PROCEED AND STOPAT commands indirectly use the TRACE function these commands also

rely on the OC5 to XIRQ connection via jumper header J7.

The EVBU allows you to use all the features of the BUFFALO evaluation software, however it

should be noted (when designing code) that BUFFALO uses the MCU on-chip RAM locations

$0047-$00FF leaving approximately 325 bytes for the user (i.e., $0000-$0047 and $0100-

$01FF). 512 bytes of EEPROM ($B600-B7FF) and approximately 325 bytes of RAM ($0000-

0047) + ($0100-$01FF) are available for user developed software.

OPERATING INSTRUCTIONS

4-2 M68HC11EVBU/D

Table 4-1 is a lists of the BUFFALO monitor memory map limitations.

Table 4-1. Monitor Memory Map Limitations

Address Restrictions

$0000–$0047 Available to user. (BUFFALO sets default value of the user stack pointer at location

$0047.)

$0048–$0065 BUFFALO monitor stack area.

$0066–$00C3 BUFFALO variables. (Refer to the buf32.asm file on the EVBU diskette).

$00C4–$00FF Interrupt pseudo vectors (jumps).

$0100–$01FF User available.

$1000–$103F MCU control registers. Although RAM and registers can be moved in the memory map,

BUFFALO expects RAM at $0000 (actually requires $0048-$00FF) and registers at

$1000-$103F.

$4000 Some versions of EVBs have a D flip-flop addressed at this location. During

initialization, BUFFALO 3.2 writes $00 to location $4000 and various monitor

operations cause $00 or $01 to be written to $4000 to retain compatibility. (Refer to the

buf32.asm file on the EVBU diskette for additional information on DFLOP, TARGCO,

and HOSTCO).

Since the EVBU has no memory or peripherals located at $4000, these writes should

not concern most EVBU users.

$9800–$9801 BUFFALO supports serial I/O to a terminal via a ACIA (external IC) located at $9800 in

the memory map. During initialization, BUFFALO 3.2 reads and writes to location

$9800 and 9801 to see if a ACIA is present in the system. If a ACIA is installed on the

EVBU wire-wrap area and connected to the MCU, refer to the buf32.asm file on the

EVBU diskette to understand implications.

$D000–$D00F BUFFALO supports serial I/O to a terminal and/or host via a DUART (external IC)

located at $D000 in the memory map. During initialization, BUFFALO 3.2 reads and

writes to location $D00C to see if a DUART is present in the system. If a DUART is

installed on the EVBU wire-wrap area and connected to the MCU, refer to the

buf32.asm file on the EVBU diskette.

OPERATING INSTRUCTIONS

M68HC11EVBU/D 4-3

4.4 OPERATING PROCEDURES

The EVBU is a simplified debugging/evaluating tool designed for debugging user programs and

evaluation of MC68HC11 family devices. Use jumper header J2 to determine weather the

BUFFALO monitor prompt is displayed, or if a jump to internal EEPROM is executed. Refer to

paragraph 2.3.1 for additional program execution selection information.

At reset, the monitor detects the state of the PE0 line. If a low state is detected, the monitor

program is executed and the prompt displayed. If a high state is detected, the monitor

automatically jumps directly to EEPROM (address location $B600) and executes user program

code without displaying the monitor prompt.

4.4.1 Debugging/Evaluation

The debugging/evaluation operation lets you debug user code under control of the BUFFALO

monitor program. User code can be assembled in one of two methods. The first method

assembles code using the BUFFALO monitor one-line assembler.

The second method, you assemble code on a host computer and then download it to the EVBU

user RAM or EEPROM in Motorola S-record format. The monitor program is then used to debug

the assembled user code.

A download to EEPROM will work if the baud rate is slow enough to allow EEPROM

programming. Since erasure and programming both require 10 milliseconds, a slow baud rate

(300 baud) will have to be used to ensure enough time between characters. If the EEPROM is

bulk erased prior to downloading, 600 baud allows enough time between characters.

4.4.2 Alternate Baud Rates

The following text assumes that a personal computer (PC) is used as the terminal device, and a

user program is assembled on the PC to produce an S-record object file which is to be

downloaded into EVBU EEPROM. For this example, no assumptions are made about the

previous EEPROM contents. During the download operation, BUFFALO determines (on a byte-

by-byte basis) whether or not erasure is required prior to programming a downloaded value into

each EEPROM location. Since erasure and programming both require 10 milliseconds, a slow

baud rate (300 baud) will have to be used to ensure enough time between characters.

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