Datasheet

78K0/Ix2 CHAPTER 2 PIN FUNCTIONS
R01UH0010EJ0500 Rev.5.00 34
Feb 28, 2012
(a) AVREF
This is the A/D converter reference voltage input pin, and the positive power supply pin of A/D converter and
ports 2 and 7.
When the A/D converter is not used, connect this pin directly to V
DD
Note
.
Note Make the AV
REF pin the same potential as the VDD pin when ports 2 and 7 are used as the digital ports.
(b) AV
SS
This is a ground potential pin of A/D converter and ports 2 and 7. Even when the A/D converter is not used,
always use this pin with the same potential as the VSS pin.
(c) VDD
V
DD is a positive power supply pin.
(d) V
SS
VSS is a ground potential pin
Note
.
Note In the 78K0/IY2 and 78K0/IA2, VSS functions alternately as the ground potential of the A/D converter. Be
sure to connect V
SS to a stabilized GND (= 0 V).
2.2.8 IC0
These are internally connected pins.
2.2.9 REGC
78K0/IY2 78K0/IA2 78K0/IB2
16 Pins 20 Pins 30 Pins/32 Pins
REGC REGC REGC
(a) REGC
This is a pin for connecting regulator output (2.0 V/2.4 V) stabilization capacitance for internal operation. Connect
this pin to V
SS via a capacitor (0.47 to 1  F). However, when using the STOP mode that has been entered since
operation of the internal high-speed oscillation clock, 0.47  F is recommended.
Also, use a capacitor with good characteristics, since it is used to stabilize internal voltage.
REGC
V
SS
Caution Keep the wiring length as short as possible for the broken-line part in the above figure.