Pin Functions - Renesas H8S Series Hardware Manual

8.8.3

Pin Functions

• P86/IRQ5/SCK1/SCL1
The pin function is switched as shown below according to the combination of the SCL1AS
and SCL1BS bits in PTCNT1, ICE bit in ICCR of IIC_1, C/A bit in SMR of SCI_1, CKE0
and CKE1 bits in SCR, and the P86DDR bit. When the ISS5 bit in ISSR is cleared to 0 and the
IRQ5E bit in IER of the interrupt controller is set to 1, this pin can be used as the IRQ5 input
pin. IICENABLE in the following table is expressed by the following logical expressions.
IICENABLE = 1 : ICE
IICENABLE
CKE1
C/A
CKE0
P86DDR
Pin function P86 input pin P86 output pin SCK1 output pin SCK1 input pin
Note: To use this pin as the SCL1 input/output pin, clear the SCL1AS and SCL1BS bits in
PTCNT1, CKE1, CKE0 bits in SCR of SCI_1 and C/A bit in SMR to 0. The output format for
SCL1 is NMOS output only, and direct bus drive is possible. When this pin is used as the
P86 output pin or SCK1 output pin, the output format is NMOS push-pull output.
• P85/IRQ4/RxD1/IrRxD
The pin function is switched as shown below according to the combination of the RE bit in
SCR of SCI_1 and the P85DDR bit. When the ISS4 bit in ISSR is cleared to 0 and the IRQ4E
bit in IER of the interrupt controller is set to 1, this pin can be used as the IRQ4 input pin.
RE
P85DDR
Pin function
SCL1AS SCL1BS
• •
0
0
0
0 1
0
0
P85 input pin
0
1

1
 
IRQ5 input pin
1
P85 output pin
IRQ4 input pin
Rev. 3.00 Jul. 14, 2005 Page 193 of 986
Section 8 I/O Ports
1



SCL1 input/output pin
1

RxD1 input pin/IrRxD input pin
REJ09B0098-0300
1
0
0
0
