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MC68340 Datasheet(PDF) 216 Page - Freescale Semiconductor, Inc

Part # MC68340
Description  Integrated Processor with DMA User?셲 Manual
PDF  441 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68340 Datasheet(HTML) 216 Page - Freescale Semiconductor, Inc

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MOTOROLA
MC68340 USER’S MANUAL
5- 79
Register Field:
The system control register is specified by the register field (see Table 5-24). The FAR
is a read-only register—any write to it is ignored.
5.6.2.8.8 Read Memory Location (READ). Read the sized data at the memory location
specified by the long-word address. Only absolute addressing is supported. The SFC
register determines the address space accessed. Valid data sizes include byte, word, or
long word.
Command Format:
15
14
13
12
11
10
9876543210
00011001
OP SIZE
000000
Command Sequence:
MS ADDR
"NOT READY"
XXX
"ILLEGAL"
LS ADDR
"NOT READY"
NEXT CMD
"NOT READY"
READ (B/W)
???
NEXT CMD
"NOT READY"
XXX
"NOT READY"
NEXT CMD
RESULT
XXX
BERR/AERR
READ
MEMORY
LOCATION
MS ADDR
"NOT READY"
XXX
"ILLEGAL"
LS ADDR
"NOT READY"
NEXT CMD
"NOT READY"
READ (LONG)
???
NEXT CMD
XXX
"NOT READY"
MS RESULT
XXX
BERR/AERR
READ
MEMORY
LOCATION
XXX
NEXT CMD
LS RESULT
"NOT READY"
Operand Data:
The single operand is the long-word address of the requested memory location.
Result Data:
The requested data is returned as either a word or long word. Byte data is returned in
the least significant byte of a word result, with the upper byte cleared. Word results
return 16 bits of significant data; long-word results return 32 bits.
A successful read operation returns data bit 16 cleared. If a bus or address error is
encountered, the returned data is $10001.
5.6.2.8.9 Write Memory Location (WRITE). Write the operand data to the memory
location specified by the long-word address. The DFC register determines the address
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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