MC68340 datasheet(217/441 Pages) FREESCALE

217 / 441 page

5- 80

MC68340 USER’S MANUAL

MOTOROLA

space accessed. Only absolute addressing is supported. Valid data sizes include byte,

word, and long word.

Command Format:

9876543210

00011000

OP SIZE

000000

Command Sequence:

MS ADDR

"NOT READY"

XXX

"ILLEGAL"

LS ADDR

"NOT READY"

NEXT CMD

"NOT READY"

WRITE (B/W)

???

NEXT CMD

"NOT READY"

XXX

"NOT READY"

XXX

BERR/AERR

NEXT CMD

"CMD COMPLETE"

DATA

"NOT READY"

WRITE

MEMORY

LOCATION

MS ADDR

"NOT READY"

XXX

"ILLEGAL"

LS ADDR

"NOT READY"

NEXT CMD

"NOT READY"

WRITE (LONG)

???

MS DATA

"NOT READY"

LS DATA

"NOT READY"

WRITE

MEMORY

LOCATION

NEXT CMD

"NOT READY"

XXX

"NOT READY"

XXX

BERR/AERR

NEXT CMD

"CMD COMPLETE"

Operand Data:

Two operands are required for this instruction. The first operand is a long-word absolute

address that specifies a location to which the operand data is to be written. The second

operand is the data. 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:

Successful write operations return a status of $0FFFF. Bus or address errors on the

write cycle are indicated by the assertion of bit 16 in the status message and by a data

pattern of $0001.

5.6.2.8.10 Dump Memory Block (DUMP). DUMP is used in conjunction with the READ

command to dump large blocks of memory. An initial READ is executed to set up the

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