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12-9
SPECIAL OPERATING MODES
Figure 12-3. Power-up and Powerdown Sequence When Using an External Interrupt
When using an external interrupt signal to exit powerdown mode, we recommend that you con-
nect the external component shown in Figure 12-4 to the RPD pin. The discharging of the capac-
itor causes a delay that allows the oscillator and phase-locked loop circuitry to stabilize before
the internal CPU and peripheral clocks are enabled.
Figure 12-4. External RC Circuit
XTAL1
CLKOUT
PH1
Internal Powerdown
Signal
EXTINT
x
Timeout
(Internal)
RPD
A3159-01
MCS
®
96
Microcontroller
C
1
RPD
A2389-02