R8C/33T Group 1. Overview
R01DS0046EJ0110 Rev.1.10 Page 8 of 47
Apr 26, 2011
1.5 Pin Functions
Table 1.5 lists Pin Functions.
I: Input O: Output I/O: Input and output
Note:
1. Refer to the oscillator manufacturer for oscillation characteristics.
Table 1.5 Pin Functions
Item Pin Name
I/O
Type
Description
Power supply input VCC, VSS — Apply 1.8 V to 5.5 V to the VCC pin. Apply 0 V to the VSS pin.
Analog power
supply input
AVCC, AVSS — 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 XOUT pin and leave
the XIN pin open.
XIN clock output XOUT I/O
INT
interrupt input INT0 to INT3
I
INT interrupt input pins.
INT0
is timer RB, and RC input pin.
Key input interrupt
KI0
to KI3
I Key input interrupt input pins
Timer RA TRAIO I/O Timer RA I/O pin
TRAO O Timer RA output 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 Timer RC I/O pins
Serial interface CLK0, CLK2 I/O Transfer clock I/O pins
RXD0, RXD2 I Serial data input pins
TXD0, TXD2 O Serial data output pins
CTS2
I Transmission control input pin
RTS2
O Reception control output pin
SCL2 I/O
I
2
C mode clock I/O pin
SDA2 I/O
I
2
C mode data I/O 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
ADTRG
I AD external trigger input pin
Sensor control unit CHxA, CHxB, CHxC I/O Control pins for electrostatic capacitive touch detection
CH0 to CH17 I Electrostatic capacitive touch detection pins
SCUTRG
I Sensor control unit external trigger input
I/O port P0_0 to P0_7,
P1_0 to P1_7,
P2_0 to P2_2,
P3_1,
P3_3 to P3_5,
P3_7,
P4_5 to P4_7
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.
All ports can be used as LED drive ports.
Input port P4_2 I Input-only port
