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Rev. 1.00, 05/04, page 112 of 544
• P50/ExTxD1
The pin function is switched as shown below according to the combination of the TE bit in
SCR of SCI_1, the SPS1 bit* in SPSR, and the P50DDR bit.
SPS1* 0 1
TE — 0 1
P50DDR 0 1 0 1 —
Pin Function P50 input pin P50 output pin P50 input
pin
P50 output
pin
ExTxD1
output pin*
Note: * The program development tool (emulator) does not support this function.
7.6 Port 6
Port 6 is an 8-bit I/O port. Port 6 pins also function as the FRT I/O pins, TMR_X I/O pins,
TMR_Y input pin, key-sense interrupt input pins, and interrupt input pins. Port 6 has the following
registers.
• Port 6 data direction register (P6DDR)
• Port 6 data register (P6DR)
• Port 6 pull-up MOS control register (KMPCR)
• System control register 2 (SYSCR2)
7.6.1 Port 6 Data Direction Register (P6DDR)
P6DDR specifies input or output for the pins of port 6 on a bit-by-bit basis.
Bit Bit Name
Initial
Value R/W Description
7 P67DDR 0 W
6 P66DDR 0 W
5 P65DDR 0 W
4 P64DDR 0 W
3 P63DDR 0 W
2 P62DDR 0 W
1 P61DDR 0 W
0 P60DDR 0 W
The corresponding port 6 pins are output ports when
P6DDR bits are set to 1, and input ports when cleared
to 0.