Freescale Semiconductor, Inc.
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
From
RESET
Is
I-Bit
Set?
Y
N
IRQ
External
Interrupt?
Y
Y
Y
Y
Clear IRQ
Latch
N
V Sync
Interrupt?
N
DDC12AB
Interrupt?
N
MFT
Interrupt?
N
PC -> (SP,SP-1)
X -> (SP-2)
A -> (SP-3)
CC -> (SP-4)
Fetch Next
Instruction
Set I-Bit in CCR
SWI
Instruction?
Y
Y
Load Interrupt
Vectors to PC
N
RTI
Instruction?
Restore Registers
from Stack
CC, A, X, PC
N
Execute
Instruction
Figure 4-1: Interrupt Processing Flowchart
SECTION 4: INTERRUPTS
Page 22
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