MC80F0104/0204
Preliminary
8
Mar. 2005 Ver 0.2
5. PIN FUNCTION
VDD: Supply voltage.
VSS: Circuit ground.
RESET: Reset the MCU.
XIN: Input to the inverting oscillator amplifier and input to
the internal main clock operating circuit.
XOUT: Output from the inverting oscillator amplifier.
R00~R07: R0 is an 8-bit, CMOS, bidirectional I/O port.
RA pins can be used as outputs or inputs according to “1”
or “0” written the their Port Direction Register(R0IO).
In addition, R0 serves the functions of the various special
features in Table 5-1 .
R10~R14: R1 is a 5-bit, CMOS, bidirectional I/O port. R1
pins can be used as outputs or inputs according to “1” or
“0” written the their Port Direction Register (R1IO).
R1 serves the functions of the various following special
features in Table 5-2
R31~R34: R3 is an 4-bit, CMOS, bidirectional I/O port.
R3 pins can be used as outputs or inputs according to “1”
or “0” written the their Port Direction Register (R3IO).
R3 serves the functions of the serial interface following
special features in Table 5-3 .
Port pin
Alternate function
R00
R01
R02
R03
R04
R05
R06
R07
INT3 ( External Interrupt Input Port3 )
SCK ( SPI CLK )
AN1 ( Analog Input Port 1 )
SI ( SPI Serial Data Input )
AN2 ( Analog Input Port 2 )
SOUT ( SPI Serial Data Output )
AN3 ( Analog Input Port 3 )
INT2 ( External Interrupt Input Port2 )
AN4 ( Analog Input Port 4 )
EC0 ( Event Counter Input Source 0 )
RXD ( UART Data Input )
AN5 ( Analog Input Port 5 )
T0O (Timer0 Clock Output )
TXD ( UART Data Output )
AN6 ( Analog Input Port 6 )
T2O (Timer2 Clock Output )
ACLK ( UART Clock Input )
AN7 ( Analog Input Port 7 )
EC1 ( Event Counter Input Source 1 )
Table 5-1 R0 Port
Port pin
Alternate function
R10
R11
R12
R13
R14
AN0 ( Analog Input Port 0 )
AVref ( External Analog Reference Pin )
PWM1O ( PWM1 Output )
INT0 ( External Interrupt Input Port 0 )
PWM3O ( PWM3 Output )
INT1 ( External Interrupt Input Port 1 )
BUZ ( Buzzer Driving Output Port )
Table 5-2 R1 Port
Port pin
Alternate function
R31
R32
R33
R34
R35
AN14 ( Analog Input Port 14 )
AN15 ( Analog Input Port 15 )
XIN ( Oscillation Input )
XOUT ( Oscillation Output )
RESET ( Reset input port )
Table 5-3 R3 Port
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