303
5.19.3
Port 3
Reset
WDDR3
Reset
WDR3
P3n
RDR3
RODR3
RPOR3
Reset
WODR3
SCI module
Serial transmit enable
Serial transmit data
WDDR3: Write to P3DDR
WDR3:
Write to P3DR
WODR3: Write to P3ODR
RPOR3: Read port 3
RDR3: Read
P3DR
RODR3: Read
P3ODR
n = 0 or 1
Notes: 1. Output enable signal
2. Open drain control signal
Priority order: SCI
>
DR
*
1
*
2
R
P3nDDR
C
Q
D
R
P3nDR
C
Q
D
R
P3nODR
C
Q
D
Internal data bus
Figure 5.23 Port 3 Block Diagram (a) (Pins P30 and P31)
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