
R8C/34E Group, R8C/34F Group, R8C/34G Group, R8C/34H Group
1. Overview
REJ03B0246-0010 Rev.0.10
Apr 17, 2008
Page 18 of 44
Under development Preliminary specification
Specifications in this manual are tentative and subject to change.
1.5
Pin Functions
Tables 1.15 and
1.16 list Pin Functions.
I: Input
O: Output
I/O: Input and output
Note:
1. Refer to the oscillator manufacturer for oscillation characteristics.
Table 1.15
Pin Functions (1)
Item
Pin Name
I/O Type
Description
Power supply input VCC, VSS
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
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
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 to INT4
IINT interrupt input pins.
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
Timer RD
TRDIOA0, TRDIOA1,
TRDIOB0, TRDIOB1,
TRDIOC0, TRDIOC1,
TRDIOD0, TRDIOD1
I/O
Timer RD I/O pins
TRDCLK
I
External clock input pin
Timer RE
TREO
O
Divided clock output pin
Serial interface
CLK0, CLK1, 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
I2C mode clock I/O pin
SDA2
I/O
I2C mode data I/O pin
SSU
SSI
I/O
Data I/O pin
SCS
I/O
Chip-select signal I/O pin
SSCK
I/O
Clock I/O pin
SSO
I/O
Data I/O pin