MC68HC05B4 Datasheet, PDF (35/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

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?
NO
IRQ
external
YES
interrupt?
YES
Turn on oscillator.
Wait for time delay to
stabilise
Generate
watchdog reset
NO
Reset?
IRQ
YES
external
NO
interrupt?
YES
Timer interrupt?
YES
NO
Restart processor clock
YES
NO
SCI interrupt?
(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 2-3 STOP and WAIT flowcharts
MC68HC05B6
Rev. 4
MODES OF OPERATION AND PIN DESCRIPTIONS
TPG
MOTOROLA
2-7