7.5.3
Pin Functions
Port 4 has different pin functions depending on whether the chip is or is not operating in slave
mode. Table 7.9 indicates the pin functions of port 4.
Table 7.9 Port 4 Pin Functions
Pin
Pin Functions and Selection Method
P47/PW1
Bit OE in TCR of PWM timer 1 and bit P47DDR select the pin function as follows
OE
0
1
P47DDR
Pin function
0
1
0
1
P47 input
P47 output
PW1 output
P46/PW0
Bit OE in TCR of PWM timer 0 and bit P46DDR select the pin function as follows
OE
0
1
P46DDR
Pin function
0
1
0
1
P46 input
P46 output
PW0 output
P45/TMRI1/
Bit P45DDR and the operating mode select the pin function as follows
HIRQ12*
P45DDR
0
—
1
Operating mode
Pin function
Not slave mode
P45 output
Slave mode
P45 input
HIRQ12 output*
TMRI1 input
TMRI1 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 1
Note: * H8/3337 Series only. H8/3397 Series ICs have no HIRQ12 pin function.
P44/TMO1/
HIRQ1*
Bits OS3 to OS0 in TCSR of 8-bit timer 1, bit P44DDR, and the operating mode
select the pin function as follows
OS3 to 0
All 0
Not all 0
P44DDR
0
1
—
—
Operating mode
—
Not slave
mode
Slave mode
Pin function
P44 input
P44 output HIRQ1 output* TMO1 output
Note: * H8/3337 Series only. H8/3397 Series ICs have no HIRQ1 pin function.
133
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