CHAPTER 4 BUS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
109
4.5.3 Bus width
V850E/MS1 carries out peripheral I/O access and external memory access in 8, 16, or 32 bits. The following
shows the operation for each access. All data is accessed in order from the lower side.
(1) Byte access (8 bits)
(a) When the data bus width is 16 bits
<1> Access to address 2n (even address)
<2> Access to address 2n + 1 (odd address)
7
0
Byte
data
7
0
15
8
External
data bus
2n
Address
7
0
Byte
data
7
0
15
8
External
data bus
2n + 1
Address
Remark
n = 0, 1, 2, 3, ···
(b) When the data bus width is 8 bits
<1> Access to address 2n (even address)
<2> Access to address 2n + 1 (odd address)
7
0
Byte
data
7
0
7
0
7
0
External
data bus
Byte
data
External
data bus
2n
2n + 1
Address
Address
Remark
n = 0, 1, 2, 3, ···
Содержание V850E/MS1 UPD703100
Страница 2: ...User s Manual U12688EJ4V0UM00 2 MEMO ...
Страница 6: ...User s Manual U12688EJ4V0UM00 6 MEMO ...
Страница 8: ...User s Manual U12688EJ4V0UM00 8 MEMO ...
Страница 12: ...User s Manual U12688EJ4V0UM00 12 MEMO ...
Страница 26: ...User s Manual U12688EJ4V0UM00 26 MEMO ...
Страница 68: ...User s Manual U12688EJ4V0UM00 68 MEMO ...
Страница 124: ...User s Manual U12688EJ4V0UM00 124 MEMO ...
Страница 198: ...User s Manual U12688EJ4V0UM00 198 MEMO ...
Страница 230: ...User s Manual U12688EJ4V0UM00 230 MEMO ...
Страница 422: ...User s Manual U12688EJ4V0UM00 422 MEMO ...