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MC68340 データシート(Datasheet) 57 Page - Freescale Semiconductor, Inc

部品番号. MC68340
部品情報  Integrated Processor with DMA User’s Manual
ダウンロード  441 Pages
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メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
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 57 page
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3- 8
MC68340 USER’S MANUAL
MOTOROLA
DSACK0
DSACK1
A0
SIZ0
SIZ1
01
X
10
D0
D8
D15
D7
(OP0)
OP0
OP0
7
0
BYTE OPERAND
DATA BUS
CYCLE 1
For a read operation, the slave responds by placing data on bits 15–8 of the data bus,
asserting
DSACK0 and negating DSACK1 to indicate an 8-bit port. The MC68340 then
reads the operand byte from bits 15–8 and ignores bits 7–0.
For a write operation, the MC68340 drives the single-byte operand on both bytes of the
data bus because it does not know the port size until the
DSACK
≈ signals are read. The
slave device reads the byte operand from bits 15–8 and places the operand in the
specified location. The slave then asserts
DSACK0 to terminate the bus cycle.
3.2.3.2 BYTE OPERAND TO 16-BIT PORT, EVEN (A0 = 0). The MC68340 drives the
address bus with the desired address and the SIZx pins to indicate a single-byte operand.
DSACK0
DSACK1
A0
SIZ0
SIZ1
0100
X
D0
D8
D15
D7
(OP0)
OP0
OP0
7
0
BYTE OPERAND
DATA BUS
CYCLE 1
For a read operation, the slave responds by placing data on bits 15–8 of the data bus and
asserting
DSACK1 to indicate a 16-bit port. The MC68340 then reads the operand byte
from bits 15–8 and ignores bits 7–0.
For a write operation, the MC68340 drives the single-byte operand on both bytes of the
data bus because it does not know the port size until the
DSACK
≈ signals are read. The
slave device reads the operand from bits 15–8 of the data bus and uses the address to
place the operand in the specified location. The slave then asserts
DSACK1 to terminate
the bus cycle.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com




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