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R8C/18 Group, R8C/19 Group
1.6
Pin Functions
Table 1.5 lists Pin Functions, Table 1.6 lists Pin Name Information by Pin Number of PLSP0020JB-A,
PRDP0020BA-A packages, and Table 1.7 lists Pin Name Information by Pin Number of PWQN0028KA-
B package.
Table 1.5
Pin Functions
Type
Power supply input VCC
Analog power
supply input
Reset input
MODE
Main clock input
Main clock output
INT interrupt
Key input interrupt
Timer X
Timer Z
Timer C
Serial interface
Reference voltage
input
Comparator
I/O port
Input port
I: Input
O: Output
Rev.1.30
Apr 14, 2006
REJ09B0222-0130
Symbol
I/O Type
VSS
AVCC, AVSS
RESET
MODE
XIN
XOUT
INT0, INT1, INT3
KI0 to KI3
CNTR0
CNTR0
TZOUT
TCIN
CMP0_0 to CMP0_2,
CMP1_0 to CMP1_2
CLK0
RXD0, RXD1
TXD0, TXD1
VREF
AN8 to AN11
P1_0 to P1_7, P3_3
to P3_5, P3_7, P4_5
P4_2, P4_6, P4_7
I/O: Input and output
Page 10 of 233
I
Apply 2.7 V to 5.5 V to the VCC pin. Apply 0 V to
the VSS pin.
I
Power supply for the comparator
Connect a capacitor between AVCC and AVSS.
I
Input "L" on this pin resets the MCU.
I
Connect this pin to VCC via a resistor.
I
These pins are provided for main clock generation
circuit I/O. Connect a ceramic resonator or a
crystal oscillator between the XIN and XOUT pins.
O
To use an external clock, input it to the XIN pin
and leave the XOUT pin open.
I
INT interrupt input pins
I
Key input interrupt input pins
I/O
Timer X I/O pin
O
Timer X output pin
O
Timer Z output pin
I
Timer C input pin
O
Timer C output pins
I/O
Transfer clock I/O pin
I
Serial data input pins
O
Serial data output pins
I
Reference voltage input pin to comparator
I
Analog input pins to comparator
I/O
CMOS I/O ports. Each port has an I/O select
direction register, allowing each pin in the port to
be directed for input or output individually.
Any port set to input can be set to use a pull-up
resistor or not by a program.
P1_0 to P1_3 also function as LED drive ports.
I
Input-only ports
1. Overview
Description
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