MC68340 datasheet(220/441 Pages) FREESCALE

220 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

5- 83

Command Sequence:

NEXT CMD

"NOT READY"

XXX

BERR/AERR

"CMD COMPLETE"

DATA

"NOT READY"

XXX

NEXT CMD

XXX

"ILLEGAL"

NEXT CMD

"NOT READY"

FILL (LONG)

???

WRITE

MEMORY

LOCATION

NEXT CMD

"NOT READY"

XXX

"NOT READY"

XXX

BERR/AERR

"CMD COMPLETE"

MS DATA

"NOT READY"

NEXT CMD

XXX

"ILLEGAL"

NEXT CMD

"NOT READY"

LS DATA

"NOT READY"

WRITE

MEMORY

LOCATION

FILL (B/W)

???

Operand Data:

A single operand is data to be written to the memory location. Byte data is transmitted

as a 16-bit word, justified in the least significant byte; 16- and 32-bit operands are

transmitted as 16 and 32 bits, respectively.

Result Data:

Status is returned as in the WRITE command: $0FFFF for a successful operation and

$10001 for a bus or address error during write.

5.6.2.8.12 Resume Execution (GO). The pipeline is flushed and refilled before normal

instruction execution is resumed. Prefetching begins at the return PC and current privilege

level. If either the PC or SR is altered during BDM, the updated value of these registers is

used when prefetching commences.

NOTE

The processor exits BDM when a bus error or address error

occurs on the first instruction prefetch from the new PC—the

error is trapped as a normal mode exception. The stacked

value of the current PC may not be valid in this case,

depending on the state of the machine prior to entering BDM.

For address error, the PC does not reflect the true return PC.

Instead, the stacked fault address is the (odd) return PC.

Command Format:

9876543210

0000110000000000

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68340 Datasheet(PDF) 220 Page - Freescale Semiconductor, Inc

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