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Chapter 31 External Bus
4.Endian and Bus Access
■ Word Access
Big endian mode Little endian mode
32-bit bus
width
16-bit bus
width
8-bit bus
width
(1)
D00
D31
AA
CC
BB
DD
WR0
WR1
WR3
WR2
D00
D31
AA
CC
BB
DD
address: Lower 2-bit: "0"
Internal External Control
Reg terminal terminal
(1)
D00
D31
AA
CC
BB
DD
WR0
WR1
WR3
WR2
D00
D31
DD
BB
CC
AA
address : "0"
Internal External Control
Reg terminal terminal
address: "0" "2"
D00
D31
D31
AA
CC
BB
DD
WR0
WR1
AA CC
BB DD
Internal External Control
Reg terminal terminal
(1) (2)
D16
AA
CC
BB
DD
WR0
WR1
DD BB
CC AA
D16
address: "0" "2"
Internal External Control
Reg terminal terminal
D00
D31
D31
D16
(1) (2)
"0" "1" "2" "3"
AA AA BB CC DD
CC
BB
DD
WR0
(1) (2) (3) (4)
address:
Internal External Control
Reg terminal terminal
D00
D31
D31
D24
AA AADD CC BB
CC
BB
DD
WR0
"0" "1" "2" "3"
(1) (2) (3) (4)
address:
Internal External Control
Reg terminal terminal
D00
D31
D31
D24