µPD16680
3.2 Logic System Pins (2/2)
Pin Symbol
Pin Name
AMPCHA
Amp mode select pin
VEXT
OSCIN
OSCOUT
OSCBRI
LCD reference supply
switching
Oscillation pin
Blinking Clock
Pin No.
79
77
80
81
83
I/O
Function Description
I Select operational amplifier mode.
At High level, “Level capacitor mode”.
At Low level, “LCD driving mode”.
I Select the method for supplying LCD power circuit. At High
level, LCD driving voltage is supplied external circuit. At Low
level, it is supplied internal circuit.
I These pins are connected with the 1 MΩ resistor. When using
external oscillation, input into the OSCIN , and leaving the
O OSCOUT open.
I This pin is oscillation input for Blinking. To input 2 Hz external
clock, when to use Blinking by external clock mode.
When not to use this pin, keep it H or L.
8
Data Sheet S12694EJ2V0DS00