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CHAPTER 2
PIN FUNCTIONS
User’s Manual U12790EJ2V0UD
(2) Non-port pins (2/2)
Pin Name
I/O
Function
After Reset
Alternate Function
TO0
Output
16-bit timer (TM0) output.
Input
P31
TO50
8-bit timer (TM50) output.
Low level
P130
TO51
8-bit timer (TM51) output.
output
P131
BEEP0
Output
Buzzer output.
Input
P36
BUZ
P37
ANI0 to ANI7
Input
Analog input to A/D converter.
Input
P10 to P17
EO0, EO1
Output
Error out output from charge pump of PLL frequency
–
synthesizer.
VCOL
Input
Inputs local oscillation frequency of PLL (in HF and MF modes).
–
VCOH
Input
Inputs local oscillation frequency of PLL (in VHF mode).
–
AMIFC
Input
Input to AM intermediate frequency counter.
Input
P101
FMIFC
Input
Input to FM intermediate frequency or AM intermediate
Input
P102
frequency counter.
RXD0Note 1
Input
Serial data input to asynchronous serial interface (UART0).
Input
P74
TXD0Note 1
Output
Serial data output from asynchronous serial interface (UART0). Input
P75
TX0Note 2
Output
IEBus controller data output.
Input
P120
RX0Note 2
Input
IEBus controller data input.
Input
P121
RESET
Input
System reset input.
–
X1
Input
Connection of crystal resonator for system clock oscillation.
–
X2
–
––
REGOSC
–
Regulator for oscillator. Connect this pin to GND via
–
a 0.1
F capacitor.
REGCPU
–
Regulator for CPU power supply. Connect this pin to GND
–
via a 0.1
F capacitor.
VDD
–
Positive power supply.
–
GND0 to GND2
–
Ground.
–
VDDPORT
–
Port power supply. Make the same potential as VDD.–
–
GNDPORT
–
Port ground. Make the same potential as GND0 to GND2.
–
AVDD
–
A/D converter positive power supply. Make the same
–
potential as VDD.
AVSS
–
A/D converter ground. Make the same potential as GND0 to
–
GND2.
VDDPLLNote 4
–
PLL positive power supply. Make the same potential as VDD.–
–
GNDPLLNote 4
–
PLL ground. Make the same potential as GND0 to GND2.
–
IC
–
Internally connected. Directly connect this pin to GND0,
–
GND1, or GND2.
VPPNote 3
–
Pin to apply high voltage at program write/verify.
–
Notes 1.
PD178076, 178078, and 178F098 only.
2.
PD178096A, 178098A, and 178F098 only.
3.
PD178F098 only.
4. Connect a capacitor of about 1000 pF between the VDDPLL and GNDPLL pins.