MC68331TS datasheet(50/84 Pages) FREESCALE

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MC68331TS/D

4.7 Background Debugging Mode

The background debugger on the CPU32 is implemented in CPU microcode. The background debug-

ging commands are summarized below.

Table 21 Background Debugging Mode

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

Read System Register

RSREG

The specified system control register is read. All registers 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

Read Memory Location

READ

Read the sized data at the memory location specified by the

long-word address. The source function code register (SFC)

determines the address space accessed.

Write Memory Location

WRITE

Write the operand data to the memory location specified by the

long-word address. The destination function code (DFC)

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 subsequent operands.

Resume Execution

The pipe is flushed and refilled before resuming instruction

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 RESET instruction.

No Operation

NOP

NOP performs no operation and can be used as a null

command.

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