Datasheet

R8C/2E Group, R8C/2F Group 1. Overview
Rev.1.00 Dec 14, 2007 Page 11 of 39
REJ03B0222-0100
1.5 Pin Functions
Table 1.8 list Pin Functions.
I: Input O: Output I/O: Input and output
NOTE:
1. Refer to the oscillator manufacturer for oscillation characteristics.
Table 1.8 Pin Functions
Type Symbol I/O Type Description
Power supply input VCC, VSS I Apply 2.7 V to 5.5 V to the VCC pin. Apply 0 V to the VSS pin.
Analog power
supply input
AVCC, AVSS I Power supply for the A/D converter.
Connect a capacitor between AVCC and AVSS.
Reset input RESET
I Input “L” on this pin resets the MCU.
MODE MODE I Connect this pin to VCC via a resistor.
XIN clock input XIN I These pins are provided for XIN clock generation circuit I/O.
Connect a ceramic resonator or a crystal oscillator between
the XIN and XOUT pins.
(1)
To use an external clock, input it to
the XIN pin and leave the XOUT pin open.
XIN clock output XOUT O
INT
interrupt input INT0, INT1, INT3 IINT interrupt input pins
Key input interrupt
KI0 to KI3
I Key input interrupt input pins
Timer RA TRAO O Timer RA output pin
TRAIO I/O Timer RA I/O pin
Timer RB TRBO O Timer RB output pin
Timer RC TRCCLK I External clock input pin
TRCTRG I External trigger input pin
TRCIOA, TRCIOB,
TRCIOC, TRCIOD
I/O Sharing output-compare output / input-capture input / PWM /
PWM2 output pins
Timer RE TREO O Timer RE output pin
Serial interface CLK0 I/O Clock I/O pin
RXD0 I Receive data input pin
TXD0 O Transmit data output pin
Reference voltage
input
VREF I Reference voltage input pin to A/D converter
A/D converter AN0 to AN11 I Analog input pins to A/D converter
D/A converter DA0 to DA1 O Output pins from D/A converter
Comparator AVREF0 to AVREF1 I Reference voltage input pins to comparator
ACMP0 to ACMP1 I Analog voltage input pins to comparator
ACOUT0 to ACOUT1 O Comparison result output pins of comparator
I/O port P0_0 to P0_7,
P1_0 to P1_7,
P3_1, P3_3 to P3_7,
P4_5,
P5_3, P5_4
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_7 also function as LED drive ports.
Input port P4_2, P4_6, P4_7 I Input-only ports