MC68340 datasheet(218/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

5- 81

starting address of the block and to retrieve the first result. Subsequent operands are

retrieved with the DUMP command. The initial address is incremented by the operand size

(1, 2, or 4) and saved in a temporary register. Subsequent DUMP commands use this

address, increment it by the current operand size, and store the updated address back in

the temporary register.

NOTE

The DUMP command does not check for a valid address in the

temporary register—DUMP is a valid command only when

preceded by another DUMP or by a READ command.

Otherwise, the results are undefined. The NOP command can

be used for intercommand padding without corrupting the

address pointer.

The size field is examined each time a DUMP command is given, allowing the operand

size to be altered dynamically.

Command Format:

9876543210

00011101

OP SIZE

000000

Command Sequence:

DUMP (LONG)

???

XXX

"NOT READY"

NEXT CMD

RESULT

XXX

BERR/AERR

XXX

"ILLEGAL"

NEXT CMD

"NOT READY"

NEXT CMD

"NOT READY"

READ

MEMORY

LOCATION

XXX

"NOT READY"

NEXT CMD

MS RESULT

XXX

BERR/AERR

XXX

"ILLEGAL"

NEXT CMD

"NOT READY"

NEXT CMD

"NOT READY"

READ

MEMORY

LOCATION

NEXT CMR

LS RESULT

DUMP (LONG)

???

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