Motorola M68CPU32BUG User Manual download pdf (Page 29)

OPERATING INSTRUCTIONS

M68332BCC/D 3-1 MOTOROLA

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CHAPTER 3

OPERATING INSTRUCTIONS

3.1 INTRODUCTION

The EPROMs on the BCC contain the M68CPU32BUG debug monitor program (hereafter

referred to as CPU32Bug). CPU32Bug is a software tool for evaluating and debugging systems

built around the MC68332 MCU. CPU32Bug allows loading, debugging, and executing of user

programs. Various CPU32Bug routines that handle I/O, data conversion, timer, and string

functions are available to user programs through system calls. For a detailed description of the

CPU32Bug functions, refer to M68CPU32BUG Debug Monitor User’s Manual,

M68CPU32BUG/AD1.

CPU32Bug consists of:

• Memory and register display and modification commands

• Breakpoint capabilities

• System calls

• Diagnostic commands

• A single-line assembler/disassembler

There are two modes of operation in the CPU32Bug monitor; the debugger mode and the

diagnostic mode. When the user is in the debugger directory the prompt CPU32Bug> appears,

and the user has access to the debugger commands (refer to paragraph 3.4). When the user is in

the diagnostic mode the prompt CPU32Diag> appears, and the user has access to the diagnostic

commands (refer to paragraph 3.4.4). These modes are also called directories.

CPU32Bug is command-driven and performs various operations in response to user commands

entered at the keyboard. CPU32Bug executes entered commands; upon completion the prompt

reappears. However, if a command is entered which causes execution of user target code (i.e.,

GO), control may or may not return to CPU32Bug. This depends upon the user program

function. Entering the help (HE) command provides a list of all possible commands and their

structure.

3.2 LIMITATIONS

CPU32Bug requires some system resources to operate properly: chip selects, level 7 interrupt,

software watchdog timer, periodic interrupt timer, and system exception vectors.

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Motorola M68CPU32BUG User Manual Page 29