SPMC68CK338CPV14 datasheet(56/133 Pages) FREESCALE

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MOTOROLA

MC68CK338

MC68CK338TS/D

4.7 Background Debugging Mode

The background debugger on the CPU32L is implemented in CPU microcode. The background debug-

ging commands are summarized in Table 34.

Table 34 Background Debugging Mode Commands

Command

Mnemonic

Description

Read D/A Register

RDREG/RAREG

Read the selected address or data register and return

the results through the serial interface.

Write D/A Register

WDREG/WAREG

The data operand is written to the specified address or

data register.

Read System Register

RSREG

The specified system control register is read. All regis-

ters that can be read in supervisor mode can be read in

background mode.

Write System Register

WSREG

The operand data is written into the specified system

control register.

Read Memory Location

READ

Read the sized data at the memory location specified

by the long-word address. The source function code

ed.

Write Memory Location

WRITE

Write the operand data to the memory location speci-

fied by the long-word address. The destination function

code (DFC) register determines the address space ac-

cessed.

Dump Memory Block

DUMP

Used in conjunction with the READ command to dump

large blocks of memory. An initial READ is executed to

set up the starting address of the block and retrieve the

first result. Subsequent operands are retrieved with the

DUMP command.

Fill Memory Block

FILL

Used in conjunction with the WRITE command to fill

large blocks of memory. Initially, a WRITE is executed

to set up the starting address of the block and supply

the first operand. The FILL command writes subse-

quent operands.

Resume Execution

The pipe is flushed and refilled before resuming in-

struction execution at the current PC.

Patch User Code

CALL

Current program counter is stacked at the location of

the current stack pointer. Instruction execution begins

at user patch code.

Reset Peripherals

RST

Asserts RESET for 512 clock cycles. The CPU is not

reset by this command. Synonymous with the CPU RE-

SET instruction.

No Operation

NOP

NOP performs no operation and can be used as a null

command.

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