Samsung Electronics
19
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.
Port
Xin
Xout
Oscillating Fr equency
4.00MHz
4.00MHz
±0.5% Error
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 3.3V, reset port becomes “low”.
Port
Xin
Xout
Voltage
5V
5V
2. Oscillator
3. Reset Circuit
4. Door S/W Detector
KA7533
29
RESET
R201
1K
R202
10K
C202
104
C203
1µF/25V
F-DOOR S/W
R-DOOR S/W
CON06
Vcc
R401(4.7K)
R403(4.7K)
R402
R404
C401
104
C402
104
7
8
10K
10K
30P
30P
x-tal
30
31
Xin
Xout