M16C30L Datasheet, PDF (145/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Programmable I/O Port
Mitsubishi microcomputers
M16C / 30L Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Port control register
b7 b6 b5 b4 b3 b2 b1 b0
Symbpl
PCR
Address
03FF16
When reset
0016
Bit symbol
Bit name
PCR0
Port P1 control register
Function
0 : When input port, read port
input level. When output port,
read the contents of port P1
register.
1 : Read the contents of port P1
register though input/output
port.
RW
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns
out to be “0”.
Figure 1.20.9. Port control register
144