HD6433044 Datasheet, PDF (834/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

C.4 Port 4 Block Diagram
8-bit bus 16-bit bus
mode mode
Mode 7
Mode
1 to 6
Write to external
address
P4 _n
Reset
R
RP4P
Q
D
P4 _n PCR
C
WP4P
Reset
R
Q
D
P4 _nDDR
C
WP4D
Reset
R
Q
D
P4_n DR
C
WP4
RP4
Read external
address
WP4P: Write to P4PCR
RP4P: Read P4PCR
WP4D: Write to P4DDR
WP4: Write to port 4
RP4: Read port 4
n = 0 to 7
Figure C-4 Port 4 Block Diagram
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