Datasheet

MC68332 MOTOROLA

MC68332TS/D 51

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 Debuggung 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 GO 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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