Hitachi H8S/2678 Series Reference Manual page 262

Pin Selection Method and Pin Functions
P81/IRQ1/ The pin function is switched as shown below according to the combination of bit
EDREQ3
P81DDR and bit ITS1 in ITSR.
P81DDR
Pin function
Note: * IRQ1 input when ITS1 = 1.
P80/IRQ0/ The pin function is switched as shown below according to the combination of bit
EDREQ2
P80DDR and bit ITS0 in ITSR.
P80DDR
Pin function
Note: * IRQ0 input when ITS0 = 1.
0
P81 input pin
EDREQ3 input pin
IRQ1 interrupt input*
0
P80 input pin
EDREQ2 input pin
IRQ0 interrupt input*
1
P81 output pin
1
P80 output pin
245