Rev. 1.00, 09/03, page 137 of 704
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
Initial Value
R/W
Description
7 P07
*
R
6 P06
*
R
5 P05
*
R
4 P04
*
R
3 P03
*
R
2 P02
*
R
1 P01
*
R
0 P00
*
R
When this register is read, the pin state is
always read.
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.
Summary of Contents for H8S/2437
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