HD64F2168 Datasheet, PDF (243/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

• P51/IRQ9/RxD0
The pin function is switched as shown below according to the combination of the RE bit in
SCR of SCI_0 and the P51DDR bit.
When the ISS9 bit in ISSR16 is cleared to 0 and the IRQ9E bit in IER16 of the interrupt
controller is set to 1, this pin can be used as the IRQ9 input pin. To use this pin as the IRQ9
input pin, clear the P51DDR bit to 0.
RE
P51DDR
Pin function
0
0
1
P51 input pin
IRQ9 input pin
P51 output pin
1

RxD0 input pin
• P50/IRQ8/TxD0
The pin function is switched as shown below according to the combination of the TE bit in
SCR of SCI_0 and the P50DDR bit.
When the ISS8 bit in ISSR16 is cleared to 0 and the IRQ8E bit in IER16 of the interrupt
controller is set to 1, this pin can be used as the IRQ8 input pin. To use this pin as the IRQ8
input pin, clear the P50DDR bit to 0.
TE
P50DDR
Pin function
0
0
1
P50 input pin
P50 output pin
IRQ8 input pin
1

TxD0 output pin
Rev. 3.00, 03/04, page 203 of 830