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Appendix C I/O Port Block Diagrams
C.1
Port 4 Block Diagram
P4
n
RP4P
RP4
WP4
WP4D
WP4P
Reset
Reset
Reset
Q
D
R
C
P4 PCR
n
Q
D
R
C
P4 DDR
n
Q
D
R
C
P4 DR
n
WP4P:
RP4P:
WP4D:
WP4:
RP4:
n = 0 to 7
Write to P4PCR
Read P4PCR
Write to P4DDR
Write to port 4
Read port 4
Write to external address
Hardware
standby
External bus released
Read external
address
Internal data bus (upper)
Internal data bus (lower)
8-bit bus
mode
16-bit bus
mode
Figure C.1 Port 4 Block Diagram
Содержание H8/3008
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