HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 241

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HD6433308

Manufacturer Part Number
HD6433308
Description
Hitachi Single-Chip MicroComputer
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet

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11.2.2 Parallel Communication Data Register 0 (PCDR0) – H’FFF1
(a) Parallel Communication Data Register 0A (PCDR0A)
(b) Parallel Communication Data Register 0B (PCDR0B)
Bit
Initial value
R/W H8/300 CPU
Parallel communication data register 0 consists of two separate 8-bit registers with the same
address. As shown in Figure 11-2, PCDR0A is written by the H8/300 CPU and read by the master
CPU; PCDR0B is written by the master CPU and read by the H8/300 CPU. This arrangement
prevents contention even if both CPUs write to PCDR0 at the same time. When either CPU reads
PCDR0, it is assured of reading data written by the other CPU.
Bit
Initial value
R/W H8/300 CPU
Master CPU
Master CPU
W
W
R
R
7
7
Figure 11-2. Parallel Communication Data Register 0
W
W
R
R
6
6
PCDR0A
Read
Write
External data bus
W
Internal data bus
W
R
R
5
5
230
W
W
R
R
4
4
PCDR0B
W
W
R
R
3
Write
Read
3
PCDR 0
W
W
R
R
2
2
H8/300 CPU
Master CPU
W
W
R
R
1
1
W
W
R
R
0
0

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