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| MC68HC05B4 Datasheet, PDF (112/298 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit | |||
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Reset
Is I-bit set?
IRQ
external interrupt?
Clear IRQ request
latch
Timer
internal interrupt?
9
SCI
internal interrupt?
Fetch next
instruction
Stack
PC, X, A, CC
Set I-bit
Load PC from:
IRQ: $1FFA-$1FFB
Timer IC: $1FF8-$1FF9
Timer OC: $1FF6-$1FF7
Timer OVF:$1FF4-$1FF5
SCI:
$1FF2-$1FF3
Execute instruction
Complete interrupt routine
and execute RTI
MOTOROLA
9-8
Figure 9-3 Interrupt ï¬ow chart
RESETS AND INTERRUPTS
TPG
MC68HC05B6
Rev. 4
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