MC68340 datasheet(213/441 Pages) FREESCALE

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5- 76

MC68340 USER’S MANUAL

MOTOROLA

Table 5-23. BDM Command Summary

Command

Mnemonic

Description

Read A/D Register

RAREG/RDREG

Read the selected address or data register and return the results

via the serial interface.

Write A/D Register

WAREG/WDREG

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 BDM.

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 SFC register determines the address space

accessed.

Write Memory Location

WRITE

Write the operand data to the memory location specified by the

long-word address. The DFC register determines the address

space accessed.

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 to 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. An initial WRITE is executed to set up the starting

address of the block and to supply the first operand. Subsequent

operands are written with the FILL command.

Resume Execution

The pipeline is flushed and refilled before resuming instruction

execution at the return PC.

Call User Code

CALL

Current PC is stacked at the location of the current SP. 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 may be used as a null command.

5.6.2.8.4 Read A/D Register (RAREG/RDREG). Read the selected address or data

Command Format:

9876543210

001000011000

A/D

Command Sequence:

RDREG/RAREG

???

XXX

MS RESULT

XXX

"ILLEGAL"

NEXT CMD

LS RESULT

NEXT CMD

"NOT READY"

Operand Data:

None

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