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CHAPTER 4 External Bus Interface
●
8-bit bus width
Figure 4.6-13 Relationship between internal register and external data bus of 8-bit bus width
■ Connection Example with External Device
●
16-bit bus width
Figure 4.6-14 Connection example with MB91191/MB91192 series and external device
(16-bit bus width)
D07
D15
D23
D31 D31
"00" "01"
External busInternal register
Output address lower
AA
BB
CC
DD
CCDD
"10" "11"
AABB
read/write
D31
|
D24
D23
|
D16
D00 D15 D08
MB91191/MB91192
D07
MSB LSB
WR0 WR1
D31-24 D23-16
WR0 WR1