MC68HC05B6_13 Datasheet, PDF (112/302 Pages) Freescale Semiconductor, Inc – Microcontrollers

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
Figure 9-3 Interrupt flow chart
Freescale
9-8
RESETS AND INTERRUPTS
MC68HC05B6
Rev. 4.1