Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 36)

OPERATING INSTRUCTIONS

M68332BCC/D 3-8 MOTOROLA

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3.4.3 System Calls

The CPU32Bug TRAP #15 handler allows system calls from user programs. A system call

accesses selected functional routines contained in CPU32Bug, including input and output

routines. TRAP #15 also transfers control to CPU32Bug at the end of a user program. For more

information on system calls, refer to Chapter 5 of the M68CPU32BUG Debug Monitor User’s

Manual, M68CPU32BUG/AD1. System calls include:

• .INCHR (input character) reads a character from the default input port.

• .INSTAT (input serial port status) checks for characters in the default input port

buffer.

• .INLN (input line (pointer/pointer format)) reads a line from the default input port.

• .READSTR (input string (pointer/count format)) reads a string of characters from the

default input port into a buffer.

• .READLN (input line (pointer/count format)) reads a string of characters from the

default input port.

• .CHKBRK (check for break) returns zero (0) status in condition code register if break

status is detected at the default input port.

• .OUTCHR (output character) outputs a character to the default output port.

• .OUTSTR (output string in pointer/pointer format) outputs a string of characters to

the default output port.

• .OUTLN (output line in pointer/pointer format) outputs a character strings followed

by a carriage return (<CR>) and a line feed (<LF>) sequence.

• .WRITE (output string in pointer/count format) formats character strings with a

count byte and outputs the string to the default output port. After formatting, the

count byte is the first byte in the string.

• .WRITELN (output line in pointer/count format) formats character strings with a

count byte and outputs the string to the default output port. After formatting, the

count byte is the first byte in the string.

• .PCRLF (output carriage return and line feed) sends a <CR> and a <LF> sequence to

the default output port.

• .ERASLN (erase line) erases the line at the present cursor position.

• .WRITD (output string with data in pointer/count format) uses the monitor I/O

routine which outputs a user string containing embedded variable fields. The user

passes the starting address of the string and the data stack address containing the data

which is inserted into the string. The output goes to the default output port.

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Motorola M68CPU32BUG Manuel d'utilisateur Page 36