214
5.4
Port 3
5.4.1
Overview
Port 3 is a 6-bit I/O port. Port 3 pins also function as SCI input/output pins (TxD0/IrTxD,
RxD0/IrRxD, SCK0, TxD1, RxD1, and SCK1), and a bus control signal output pin (
OE
). The
functions of pins P34 to P30 are the same in all operating modes, while the function of pin P35
changes according to the operating mode.
Figure 5.3 shows the port 3 pin configuration.
P35 (I/O) / SCK1 (I/O) /
OE
(output)
P34 (I/O) / SCK0 (I/O)
P33 (I/O) / RxD1 (input)
P32 (I/O) / RxD0/IrRxD (input)
P31 (I/O) / TxD1 (output)
P30 (I/O) / TxD0/IrTxD (output)
Modes 1, 2, 4, 5, 6, 7 (EXPE = 1)
P35 (I/O) / SCK1 (I/O) /
OE
(output)
P34 (I/O) / SCK0 (I/O)
P33 (I/O) / RxD1 (input)
P32 (I/O) / RxD0/IrRxD (input)
P31 (I/O) / TxD1 (output)
P30 (I/O) / TxD0/IrTxD (output)
Mode 7 (EXPE = 0)
P35 (I/O) / SCK1 (I/O)
P34 (I/O) / SCK0 (I/O)
P33 (I/O) / RxD1 (input)
P32 (I/O) / RxD0/IrRxD (input)
P31 (I/O) / TxD1 (output)
P30 (I/O) / TxD0/IrTxD (output)
Port 3
Port 3 pins
Figure 5.3 Port 3 Pin Functions
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