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space accessed. Only absolute addressing is supported. Valid data sizes include byte,
word, and long word.
Command Format:
15
0
14
0
13
0
12
1
11
1
10
0
9
0
8
0
7
6
5
0
4
0
3
0
2
0
1
0
0
0
OP SIZE
Command Sequence:
WRITE
MEMORY
LOCATION
WRITE (B/W)
MS ADDR
"NOT READY"
LS ADDR
"NOT READY"
DATA
"NOT READY"
XXX
"NOT READY"
???
XXX
NEXT CMD
XXX
NEXT CMD
"ILLEGAL"
"NOT READY"
"CMD COMPLETE"
XXX
BERR/AERR
NEXT CMD
"NOT READY"
WRITE (LONG)
???
MS ADDR
"NOT READY"
LS ADDR
"NOT READY"
MS DATA
"NOT READY"
XXX
NEXT CMD
"ILLEGAL"
"NOT READY"
WRITE
MEMORY
LOCATION
LS DATA
"NOT READY"
XXX
"NOT READY"
NXEXXXT CMD
"CMD COMPLETE"
XXX
BERR/AERR
NEXT CMD
"NOT READY"
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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MC68340 USER’S MANUAL
MOTOROLA
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