ST20P18

Ver 1.4

9/12

6/13/07

VDD

: 3V

Clock

: 32768Hz crystal and 4.0MHz RC oscillator

LCD

: 1/8 duty

I/O

: PORT A

ALARM

: PSGO, PSGOB

FIGURE 8-2: APPLICATION CIRCUIT WITH LCD KEYBOARD AWAKING PULSE

Note:

1. COMs and SEGs output GND level, while the LCD is turned off.

2. If LCD is turned off, Keyboard Awaking Pulses must be turned off at the

same time.

3.

Connect one capacitor of 100PF to OSCI stabilize oscillation frequency.

This capacitor must be placed close to OSCI.