Pin Functions - Renesas H8S/2319 series Hardware Manual

8.4.3

Pin Functions

Port 3 pins also function as SCI I/O pins (TxD0, RxD0, SCK0, TxD1, RxD1, and SCK1) and
interrupt input pins (IRQ4, IRQ5). Port 3 pin functions are shown in table 8-7.
Table 8-7 Port 3 Pin Functions
Pin Selection Method and Pin Functions
P35/SCK1/IRQ5 The pin function is switched as shown below according to the combination of
bit C/A in the SCI1 SMR, bits CKE0 and CKE1 in SCR, and bit P35DDR.
CKE1
C/A
CKE0
P35DDR
Pin function
Notes: 1. When P35ODR = 1, the pin becomes an NMOS open-drain output.
P34/SCK0/IRQ4 The pin function is switched as shown below according to the combination of
bit C/A in the SCI0 SMR, bits CKE0 and CKE1 in SCR, and bit P34DDR.
CKE1
C/A
CKE0
P34DDR
Pin function
Notes: 1. When P34ODR = 1, the pin becomes an NMOS open-drain output.
0
0
P35
output pin *
input pin
2. When this pin is used as an external interrupt input, it should not be
used as an input/output pin with other functions.
0
0
P34
output pin *
input pin
2. When this pin is used as an external interrupt input, it should not be
used as an input/output pin with other functions.
0
0
1
1 —
P35 SCK1
1 1
output pin *
IRQ5 interrupt input pin *
0
0
1
1 —
P34 SCK0
1 1
output pin *
IRQ4 interrupt input pin *
Rev. 5.00, 12/03, page 245 of 1088
1
1 —
— —
— —
SCK1 SCK1
1
output pin *
input pin
2
1
1 —
— —
— —
SCK0 SCK0
1
output pin *
input pin
2