MC68HC05X16 Datasheet, PDF (33/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
STOP
WAIT
2
YES _{Watchdog active?}
NO
Stop oscillator and all
clocks.
Clear I bit.
Oscillator active. Timer,
SCI, A/D, EEPROM clocks
active. Processor clocks
stopped. Clear I-bit
NO
Reset ?
Reset ?
NO
NO
CIRQ,
wired-OR, external
YES
interrupt?
YES
YES
WOI ?
NO
YES
Timer interrupt ?
NO
YES
SCI ?
NO
Turn on oscillator.
Wait for time delay to
stabilise
Restart processor clock
Generate watchdog
interrupt
YES
NO
CIRQ ?
YES
(1) Fetch reset vector or
(2) Service interrupt:
a. stack
b. set I-bit
c. vector to interrupt
routine
(1) Fetch reset vector or
(2) Service interrupt:
a. stack
b. set I-bit
c. vector to interrupt
routine
Figure 2-4 STOP and WAIT flow charts
MC68HC05X16 MODES OF OPERATION AND PIN DESCRIPTIONS
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2-9
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