C541U Datasheet, PDF (36/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
EWPD
(PCON1.7)
WS
(PCON1.4)
Activity on
USB Bus
P3.2 / INT0
Control
Logic
XTAL1
XTAL2
RC
Oscillator
On-Chip
Oscillator
Start /
Stop
f _RC
3 MHz
Start /
Stop
Power - Down
Mode Activated
Control
Logic
Power-Down Mode
Wake - Up Interrupt
Internal Reset
10 ^{f 1}
Frequency
f ₂ ^Comparator
f₂<f₁
Delay
OWDS
>1
WDCON (C0 _H)
Int. Clock
MCD03385
Figure 18
Functional Block Diagram of the Oscillator Watchdog
Semiconductor Group
34