UPD70F3208 Datasheet, PDF (92/757 Pages) NEC – 32-Bit Single-Chip Microcontrollers

CHAPTER 2 PIN FUNCTIONS
(17) REGC (regulator control) ... Input
This is the pin for connecting a capacitor for the regulator.
(18) X1, X2 (crystal for main clock)
These pins are used to connect the resonator that generates the main clock.
An external clock can also be input.
(19) XT1, XT2 (crystal for subclock)
These pins are used to connect the resonator that generates the subclock.
(20) AVSS (ground for analog)
This is the ground pin for the A/D converter and D/A converter.
(21) AVREF0 (analog reference voltage) ... Input
This is the pin for supplying the reference voltage for the A/D converter.
(22) AVREF1 (analog reference voltage) ... Input
This is the pin for supplying the reference voltage for the D/A converter.
(23) BVDD (power supply for bus interface)
This is the positive power supply pin for the bus interface.
(24) BVSS (ground for bus interface)
This is the ground pin for the bus interface.
(25) EVDD (power supply for ports)
This is the power supply pin for the peripheral interface.
(26) EVSS (ground for ports)
This is the ground pin for the peripheral interface.
(27) VDD (power supply)
These are the positive power supply pins. All VDD pins should be connected to a positive power supply.
(28) VPP (programming power supply)
This is the positive power supply pin used for the flash memory programming mode.
It is provided for products with flash memory. During normal mode operation, connect this pin to VSS.
(29) VSS (ground)
These are the ground pins. Connect all VSS pins to a positive power supply.
(30) IC (internally connected)
This is an internally connected pin. Connect this pin directly to VSS in the normal operation mode.
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User’s Manual U15862EJ3V0UD