Datasheet

Section 10 I/O Ports
Rev. 6.00 Mar. 18, 2010 Page 320 of 982
REJ09B0054-0600
• P33/TxD1/SCL1
The pin functions are switched as shown below according to the combination of the ICE bit
*
2
in ICCR_1 of IIC_1, the TE bit in SCR_1 of SCI_1, and the P33DDR bit. SCL1 functions as
NMOS open drain output and can drive bus directly.
ICE
*
2
0 1
TE 0 1 ⎯
P33DDR 0 1 ⎯ ⎯
Pin functions P33 input pin P33 output pin
*
1
TxD1 output pin
*
1
SCL1 I/O pin
*
2
Notes: 1. When P33ODR is set to 1, it functions as NMOS open drain output.
2. Not available in the H8S/2237 Group and H8S/2227 Group.
• P32/SCK0/SDA1/IRQ4
The pin functions are switched as shown below according to the combination of the ICE bit
*
3
in ICCR_1 of IIC_1, the C/A bit in SMR_0 of SCI_0, CKE1 and CKE0 bits in SCR, and the
P32DDR bit. To use this port as SDA1 input pin, clear the C/A bit, CKE0 bit, and CKE1 bit to
0. The SDA1 functions as NMOS open drain output and can drive bus directly.
ICE
*
3
0 1
CKE1 0 1 0
C/A 0 1 ⎯ 0
CKE0 0 1 ⎯ ⎯ 0
P32DDR 0 1 ⎯ ⎯ ⎯ ⎯
Pin functions P32 input
pin
P32 output
pin
*
1
SCK0 output
pin
*
1
SCK0 output
pin
*
1
SCK0 input
pin
SDA1 I/O
pin
*
3
IRQ4 Input
*
2
Notes: 1. When P32ODR is set to 1, it functions as NMOS open drain output.
2. When this pin is used as an external interrupt pin, do not specify other functions.
3. Not available in the H8S/2237 Group and H8S/2227 Group.
• P31/RxD0
The pin functions are switched as shown below according to the combination of the RE bit in
SCR_0 of SCI_0 and the P31DDR bit.
RE 0 1
P31DDR 0 1 ⎯
Pin functions P31 input pin P31 output pin
*
RxD0 input
Note: * When P31ODR is set to 1, it functions as NMOS open drain output.