Datasheet

Section 8 I/O Ports
Rev.7.00 Feb. 14, 2007 page 249 of 1108
REJ09B0089-0700
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 0 1
C/A 0 1 —
CKE0 0 1 — —
P35DDR 0 1 — — —
Pin function P35
input pin
P35
output pin
*
1
SCK1
output pin
*
1
SCK1
output pin
*
1
SCK1
input pin
IRQ5 interrupt input pin
*
2
Notes: 1. When P35ODR = 1, the pin becomes an NMOS open-drain output.
2. When this pin is used as an external interrupt input, it should not be
used as an input/output pin with other functions.
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 0 1
C/A 0 1 —
CKE0 0 1 — —
P34DDR 0 1 — — —
Pin function P34
input pin
P34
output pin
*
1
SCK0
output pin
*
1
SCK0
output pin
*
1
SCK0
input pin
IRQ4 interrupt input pin
*
2
Notes: 1. When P34ODR = 1, the pin becomes an NMOS open-drain output.
2. When this pin is used as an external interrupt input, it should not be
used as an input/output pin with other functions.