Oscillator; Reset Circuit; Door S/W Detector - Samsung SR-L677EV Service Manual

6-2. Oscillator

Oscillating Frequency
Port
Xin(#19)
Xout(#20)
±0.5% Error

6-3. Reset Circuit

Port
Vcc
Reset

6-4. Door S/W Detector

4.00MHz
4.00MHz
Voltage
5V
5V
It is designed for clock generation and time
calculation for synchronizing transmission and
reception on the logic elements inside the MICOM.
If the X-TAL specification changes, MICOM may
make an error.
(The standard components should be used.)
When power is supplied to MICOM, reset circuit
initializes RAM and other parts on MICOM to
initialize all programs. Reset voltage maintains "low"
for hundreds of µsec comparing to MICOM Vcc
voltage when power is input. It also maintains
"high"(5V) during normal operation. But, when Vcc
drops to 3.4V-3.7V, reset port becomes "low".
20