7.5
Port 4
7.5.1
Overview
Port 4 is an 8-bit input/output port that is multiplexed with input/output pins (TMRI0, TMRI1,
TMCI0, TMCI1, TMO0, TMO1) of 8-bit timers 0 and 1 and output pins (PW0, PW1) of PWM timers
0 and 1. In slave mode, P43 to P45 output host interrupt requests. Pins not used by timers or for
host interrupt requests are available for general input/output.
Figure 7.12 shows the pin configuration of port 4.
Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor.
Port 4 pins
P47/PW1
P46/PW0
P45/TMRI1/HIRQ12
P44/TMO1/HIRQ1
Port 4
P43/TMCI1/HIRQ11
P42/TMRI0
P41/TMO0
P40/TMCI0
Pin configuration in modes 1 to 3
Master mode
Slave mode
P47 (input/output)/PW1 (output)
P47 (input/output)/PW1 (output)
P46 (input/output)/PW0 (output)
P45 (input/output)/TMRI1 (input)
P44 (input/output)/TMO1 (output)
P43 (input/output)/TMCI1 (input)
P42 (input/output)/TMRI0 (input)
P41 (input/output)/TMO0 (output)
P40 (input/output)/TMCI0 (input)
P46 (input/output)/PW0 (output)
HIRQ12 (output)/TMRI1 (input)
HIRQ1 (output)/TMO1 (output)
HIRQ11 (output)/TMCI1 (input)
P42 (input/output)/TMRI0 (input)
P41 (input/output)/TMO0 (output)
P40 (input/output)/TMCI0 (input)
Figure 7.12 Port 4 Pin Configuration
121
HITACHI [ HITACHI SEMICONDUCTOR ]
