Panasonic MN101C77C User Manual

IV - 45

Chapter 4    I/O Ports

Real Time Output Control (Port 1)

P10 , P12 and P14 has a real time output function that can switch pin's output at the falling edge of the

external interrupt 0 pin (P20/IRQ0).

Real time control can change timer output signal (PWM output, timer pulse output, remote control carrier

output), without setting on the program, in synchronization with external event. Output levels to be

switched at event generation are 3 ; "0", "1" and "high impedance (Hi-z)".

Table 4-10-1 shows the real time output control register of port 1.

Register

Address

R/W

Function

Page

P1OUT

x'03F11'

R/W

Port 1 output register

IV - 13

P1OMD

x'03F2F'

R/W

Port 1 output mode register

IV - 14

P1DIR

x'03F31'

R/W

Port 1 direction control register

IV - 13

P1PLU

x'03F41'

R/W

Port 1 pull-up control register

IV - 13

P1TCNT

x'03F7E'

R/W

Port 1 output control register

IV - 14

Port 1