7.9.3
Pin Functions
Pins P86 to P80 are multiplexed with HIF input/output, SCI1 input/output, I2C clock input/output,
and IRQ5 to IRQ3 input. Table 7.17 indicates the functions of pins P86 to P80.
Table 7.17 Port 8 Pin Functions
Pin
Pin Functions and Selection Method
P86/IRQ5/
SCK1/SCL*
Bit C/A in SMR of SCI1, bits CKE0 and CKE1 in SCR of SCI1, bit ICE in ICCR,
and bit P86DDR select the pin function as follows
ICE
0
1
CKE1
0
1
—
—
—
—
C/A
0
1
1
—
—
—
CKE0
0
1
—
—
P86DDR
Pin function
0
—
P86
input
P86
output
SCK1
output
SCK1
output
SCK1
intput
SCL
input/
output*
IRQ5 input
IRQ5 input is usable when bit IRQ5E is set to 1 in IER
Note: * H8/3337 Series only. H8/3397 Series ICs have no SCL pin function.
P85/IRQ4/
CS2*/RxD1
Bit RE in SCR of SCI1, bit STAC in STCR, bit P85DDR, and the operating mode
select the pin function as follows
Operating mode
STAC
Slave mode
Not slave mode
0
1
—
RE
—
—
0
1
0
1
P85DDR
Pin function
0
1
—
0
1
—
CS2
input*
P85
P85
RxD1
input
P85
P85
RxD1
input output
input output input
IRQ4 input
IRQ4 input is usable when bit IRQ4E is set to 1 in IER
Note: * H8/3337 Series only. H8/3397 Series ICs have no CS2 pin function.
148
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