UPD705100GJ-100-8 NEC [NEC], UPD705100GJ-100-8 Datasheet - Page 16

• Manufacturer Part Number: UPD705100GJ-100-8
• Description: V830TM 32-BIT MICROCONTROLLER
• Manufacturer: NEC [NEC]

16
4.2 Relationship between External Access and Byte Enable Signals
to the byte enable signals as indicated below.
Byte
Halfword
Word
Burst transfer
In 16-bit bus mode, the BE3/A1 output acts as A1 and BE2/BH output acts as BH. External accesses are related
Data length
Bit 1
Operand address
0
0
1
1
0
1
0
0
operation
Internal
unit
Ta, Tw1 state
Bit 0
0
1
0
1
0
0
0
0
Write buffer
16
15
31
0
B
Table 4-1. 16-Bit Bus Mode
A
Figure 4-4. Write Cycle
16
15
31
A1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
A
Data bus
BH
Byte enable
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
BE1
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
operation
Internal
unit
BE0
Tw2 state
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
Write buffer
31
16
15
0
B
16
15
31
0
Ta,Tw1
Ta,Tb1
B
Ta,Ts
Ta,Ts
Ta,Ts
Ta,Ts
Ta,Ts
Ta,Ts
State
Tw2
Tb2
Tb3
Tb4
Tb5
Tb6
Tb7
Tb8
Data bus
PD705100