Renesas H8S/2437 Hardware Manual page 198

• P31/D9/ExIRQ1
When the IRQ1S bit in PTCNT1 is set to 1, this pin can be used as the ExIRQ1 pin.
The pin function is switched as shown below according to the operating mode, the IRQ1S bit,
and the P31DDR bit.
Normal
Extended Mode
(ADMXE = 0)
P31DDR
Pin function D9 I/O pin
* When the IRQ1S bit in PTCNT1 is set to 1, this pin functions as the ExIRQ1 input pin.
Note:
• P30/D8/ExIRQ0
When the IRQ0S bit in PTCNT1 is set to 1, this pin can be used as the ExIRQ0 pin.
The pin function is switched as shown below according to the operating mode, the IRQ0S bit,
and the P30DDR bit.
Normal
Extended Mode
(ADMXE = 0)
P30DDR
Pin function D8 I/O pin
* When the IRQ0S bit in PTCNT1 is set to 1, this pin functions as the ExIRQ0 input pin.
Note:
Rev. 1.00, 09/03, page 160 of 704
Extended Mode (EXPE = 1)
Multiplex Extended Mode
(ADMXE = 1)

0
P31 input pin
Extended Mode (EXPE = 1)
Multiplex Extended Mode
(ADMXE = 1)

0
P30 input pin
Single-Chip Mode (EXPE = 0)
1
P31 output pin P31 input pin
ExIRQ1 input pin*
Single-Chip Mode (EXPE = 0)
1
P30 output pin P30 input pin
ExIRQ0 input pin*
0 1
P31 output pin
0 1
P30 output pin