µPD178023, 178024
1.2 Pins Other Than Port Pins
Pin Name
I/O
Function
At Reset
Shared by:
P00-P04
INTP0-INTP4 Input
External maskable interrupt input whose valid edge
(rising edge, falling edge, or both rising and falling edges)
can be specified.
Input
SI3
Input
Output
I/O
Serial data input to serial interface.
Input
Input
Input
P70
P71
P76
SO3
SDA0
Serial data output from serial interface.
Serial data input/output to/from
serial interface.
N-ch open drain I/O
SCK3
I/O
Serial clock input/output to/from serial interface.
N-ch open drain I/O
Input
Input
Input
P72
SCL0
P77
RXD0
TXD0
Input
Serial data input to asynchronous serial interface (UART0).
Serial data output from asynchronous serial interface (UART0).
External count clock input to 8-bit timer (TM50).
External count clock input to 8-bit timer (TM51).
8-bit timer (TM50) output.
P74
Output
Input
P75
TI50
P33
TI51
P34
TO50
Output
Low-level
output
P130
P131
P36
TO51
8-bit timer (TM51) output.
BEEP0
ANI0-ANI5
EO0, EO1
Output
Input
Buzzer output.
Input
Input
–
Analog input to A/D converter.
P10-P15
–
Output
Error out output from charge pump of PLL frequency
synthesizer.
VCOL
VCOH
AMIFC
FMIFC
RESET
X1
Input
Input
Inputs local oscillation frequency of PLL (in HF and MF modes).
Inputs local oscillation frequency of PLL (in VHF mode).
Input to AM intermediate frequency counter.
–
–
–
Input
Input to FM or AM intermediate frequency counter.
System reset input.
Input
Input
–
–
–
–
–
–
–
–
–
Connection of crystal resonator for system clock oscillation.
X2
REGOSC
–
Regulator for oscillator. Connect this pin to GND via 0.1-µF
capacitor.
REGCPU
–
Regulator for CPU power supply. Connect this pin to GND
–
–
via 0.1-µF capacitor.
VDD
–
–
–
–
–
–
–
Positive power supply.
–
–
–
–
–
–
–
–
–
–
–
–
–
–
GND
Ground.
VDDPORT
GNDPORT
VDDPLLNote
GNDPLLNote
IC
Port power supply.
Port ground.
PLL positive power supply.
PLL ground.
Internally connected. Directly connect this pin to GND.
Note Connect a capacitor of about 1000 pF between the VDDPLL and GNDPLL pins.
12
Data Sheet U14126EJ1V0DS00
NEC [ NEC ]
