Datasheet

User’s Manual U18698EJ1V0UD
27
CHAPTER 2 PIN FUNCTIONS
2.1 Pin Function List
There are three types of pin I/O buffer power supplies: AV
REF
Note
, VLC0, and VDD. The relationship between these
power supplies and the pins is shown below.
Table 2-1. Pin I/O Buffer Power Supplies
Power Supply Corresponding Pins
AVREF
Note
P20 to P25
VLC0 COM0 to COM7, SEG0 to SEG21, VLC0 to VLC3
VDD Pins other than above
Note
μ PD78F041x only. The power supply is VDD with μ PD78F040x.
(1) Port pins (1/2)
Function Name I/O Function After Reset Alternate Function
P12 RxD0/KR3/<RxD6>
P13
I/O
Port 1.
2-bit I/O port.
Input/output can be specified in 1-bit units.
Use of an on-chip pull-up resistor can be specified by a
software setting.
Input port
TxD0/KR4/<TxD6>
P20 SEG21/ANI0
Note
P21 SEG20/ANI1
Note
P22 SEG19/ANI2
Note
P23 SEG18/ANI3
Note
P24 SEG17/ANI4
Note
P25
I/O
Port 2.
6-bit I/O port.
Input/output can be specified in 1-bit units.
Digital
input port
SEG16/ANI5
Note
P31 TOH1/INTP3
P32 TOH0/MCGO
P33
TI000/RTCDIV/
RTCCL/BUZ/INTP2
P34
I/O
Port 3.
4-bit I/O port.
Input/output can be specified in 1-bit units.
Use of an on-chip pull-up resistor can be specified by a
software setting.
Input port
TI52/TI010/TO00/
RTC1HZ/INTP1
P40 I/O
Port 4.
1-bit I/O port.
Input/output can be specified in 1-bit units.
Use of an on-chip pull-up resistor can be specified by a
software setting.
Input port V
LC3/KR0
Note
μ PD78F041x only.
Remark The functions within arrowheads (< >) can be assigned by setting the input switch control register (ISC).