Datasheet

C505/C505C/C505A/C505CA
Data Sheet 48 12.00
Figure 25
Functional Block Diagram of the Oscillator Watchdog
Int. Clock
XTAL2
XTAL1
OWDS
MCB03308
IP0 (A9 )
H
3 MHz
f
RC
Delay
1
f
2
f
2
f
1
f
<
P4.1 / RXDC
Start /
Stop
Start /
Stop
Mode Activated
Power - Down
Power-Down Mode
Wake - Up Interrupt
Internal Reset
10
P3.2 / INT0
Control
WS
(PCON1.4)(PCON1.7)
EWPD
>1
Frequency
Comparator
RC
On-Chip
Oscillator
Logic
Oscillator
Logic
Control