SAB-C509-LM SIEMENS [Siemens Semiconductor Group], SAB-C509-LM Datasheet - Page 26

• Manufacturer Part Number: SAB-C509-LM
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

C509-L
Reset and System Clock
The reset input is an active low input at pin RESET. Since the reset is synchronized internally, the
RESET pin must be held low for at least two machine cycles (12 oscillator periods) while the
V
oscillator is running. A pullup resistor is internally connected to
to allow a power-up reset with
CC
V
an external capacitor only. An automatic reset can be obtained when
is applied by connecting
CC
the reset pin to
V
via a capacitor. Figure 12 shows the possible reset circuitries.
SS
Figure 12
Reset Circuitries
Figure 13 shows the recommended oscillator circiutries for crystal and external clock operation.
Figure 13
Recommended Oscillator Circuitries
Semiconductor Group
25
09.96