Hitachi H8S/2633 Hardware Manual page 1129

* 1
P37
*
2
Legend
WDDR3
: Write to P3DDR
WDR3
: Write to P3DR
WODR3
: Write to P3ODR
RDR3
: Read P3DR
RPOR3
: Read port 3
RODR3
: Read P3ODR
Notes: 1. Output enable signal
Figure C-2 (h) Port 3 Block Diagram (Pin P37)
Reset
R
Q
P37DDR
C
WDDR3
Reset
R
Q
P37DR
C
WDR3
Reset
R
Q
P37ODR
C
WODR3
RODR3
RDR3
RPOR3
2. Open drain control signal
D
D
D
SCI module
Serial transmit enable
Serial transmit data
TxD4
1117