CHAPTER 2 PIN FUNCTIONS
User’s Manual U17446EJ3V1UD
24
2.2.8 X1 and X2
These pins connect an oscillator to oscillate the X1 input clock.
X1 and X2 also function as the P121 and P122 pins, respectively. For settings of alternate function, refer to
CHAPTER 18 OPTION BYTE
.
Supply an external clock to X1.
Caution The P121/X1 and P122/X2 pins are pulled down during reset.
2.2.9 AV
REF
This pin inputs a reference voltage to the internal A/D converter. When the A/D converter is not used, connect this
pin to V
DD
.
2.2.10 AV
SS
This is the A/D converter ground potential pin. Even when the A/D converter is not used, always use this pin with
the same potential as the V
SS
pin.
2.2.11 V
DD
This is the positive power supply pin.
2.2.12 V
SS
This is the ground pin.
Содержание 78K0S/KB1+
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