UPD78F9500MA-CAC-A Datasheet, PDF (28/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 2 PIN FUNCTIONS
2.2.6 EXCLK (μPD78F950x)
This is the external clock input pin for the main system clock.
EXCLK functions as P23. For the setting method for pin functions, see CHAPTER 15 OPTION BYTE.
Caution The P23/EXCLK pin is pulled down during reset.
2.2.7 VDD
This is the positive power supply pin.
In μPD78F920x, VDD functions alternately as the A/D converter reference voltage input.
converter, stabilize VDD at the supply voltage used (2.7 to 5.5 V).
When using the A/D
2.2.8 VSS
This is the ground pin.
In μPD78F920x, VSS functions alternately as the ground potential of the A/D converter. Be sure to connect VSS to a
stabilized GND (= 0 V).
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User’s Manual U18172EJ3V0UD