Appendix C I/O Port Block Diagrams; Port 4 Block Diagram - Hitachi H8/3008 Hardware Manual

Appendix C I/O Port Block Diagrams

C.1

Port 4 Block Diagram

P4
n
WP4P: Write to P4PCR
RP4P: Read P4PCR
WP4D: Write to P4DDR
WP4: Write to port 4
RP4: Read port 4
n = 0 to 7
8-bit bus 16-bit bus
mode mode
Hardware
standby
Write to external address
External bus released
Read external
address
Figure C.1 Port 4 Block Diagram
Reset
R
Q D
P4 PCR
n
C
RP4P
WP4P
Reset
R
Q D
P4 DDR
n
C
WP4D
Reset
R
Q D
P4 DR
n
C
WP4
RP4
587