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•
VCOH
• VHF input
• This pin becomes active when the FM mode is selected by software; otherwise the pin is in the status set
by bit 3 (VCOHDMD) of the PLL mode select register (PLLMD). If VCOHDMD is reset to 0 (to connect a
pull-down resistor), however, the VCOL pin does not become active even if the FM mode is selected. In
this case, set VCOHDMD to 1 (high-impedance state).
2.2.12 AMIFC
Input pin of the AM intermediate frequency counter.
2.2.13 FMIFC
Input pin of the FM intermediate frequency counter or AM intermediate frequency counter.
2.2.14 RESET
Low-level active system reset input pin.
2.2.15 X1, X2
Crystal resonator connection pins for system clock oscillation.
2.2.16 REGOSC
Regulator pin for oscillator. Connect to GND via a 0.1 µ F capacitor.
2.2.17 REGCPU
Regulator pin for CPU power supply. Connect to GND via a 0.1 µ F capacitor.
2.2.18 V
DD
Positive power supply pin.
2.2.19 GND
Ground potential pin.
2.2.20 V
PORT
DD
Positive power supply pin for port.
2.2.21 GNDPORT
Ground potential pin for port.
2.2.22 V
PLL
DD
Positive power supply pin for PLL.
2.2.23 GNDPLL
Ground potential pin for PLL.
( µ PD178F054 only)
2.2.24 V
PP
This pin applies a high voltage when the flash memory programming mode is set or when a program is written
or verified.
In the normal operation mode, directly connect this pin to GND.
CHAPTER 2 PIN FUNCTION
User's Manual U15104EJ2V0UD
33
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