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/
HIRQ12
Bit P45DDR and the operating mode select the pin function as follows
P45DDR
0
—
1
Operating mode
Pin function
Not slave mode
P45 output
Slave mode
P45 input
HIRQ12 output
TMRI1 input*
Note: * TMRI1 input is usable when bits CCLR1 and CCLR0 are both set to 1 in
TCR of 8-bit timer 1
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
124
HITACHI [ HITACHI SEMICONDUCTOR ]
