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7.1
Port 0
Port 0 is an 8-bit input port. Port 0 pins also function as A/D converter analog input pins and
EXIRQ input pins.
Port 0 has the following register.
• Port 0 register (PORT0)
7.1.1
Port 0 Register (PORT0)
PORT0 is an 8-bit read-only register, that reflects the pin state in port 0. PORT0 cannot be
modified.
Bit
Bit Name
7
P07
6
P06
5
P05
4
P04
3
P03
2
P02
1
P01
0
P00
Note:
* Determined by the states of the P07 to P00 pins.
7.1.2
Pin Functions
If the corresponding bit in PTCNT1 is set to 1, the port 0 pins can be used as interrupt input pins
(ExIRQ7 to ExIRQ4).
Pin function relationships are listed below.
Note: When these pins are set as the interrupt input pins, do not use them as the A/D converter
pins.
Initial Value
R/W
*
R
*
R
*
R
*
R
*
R
*
R
*
R
*
R
Description
When this register is read, the pin state is
always read.
Rev. 1.00, 09/03, page 137 of 704
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