M68HC11K Datasheet, PDF (126/290 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Resets and Interrupts
2A
Y
BIT I IN
CCR = 1?
N
ANY I-BIT _Y
INTERRUPT
PENDING?
N
FETCH OPCODE
STACK CPU
REGISTERS
STACK CPU
REGISTERS
SET BIT I IN CCR
FETCH VECTOR
$FFF8, $FFF9
Y
ILLEGAL
OPCODE?
N
WAI
Y
INSTRUCTION?
N
STACK CPU
REGISTERS
SET BIT I IN CCR
FETCH VECTOR
$FFF6, $FFF7
Y
SWI
INSTRUCTION?
N
Y
RTI
INSTRUCTION?
RESTORE CPU
REGISTERS
FROM STACK
N
EXECUTE THIS
INSTRUCTION
STACK CPU
REGISTERS
N
ANY
INTERRUPT
PENDING?
Y
SET BIT I IN CCR
RESOLVE INTERRUPT
PRIORITY AND FETCH
VECTOR FOR HIGHEST
PENDING SOURCE
1A
Figure 5-8. Processing Flow Out of Reset (Sheet 2 of 2)
Technical Data
126
Resets and Interrupts
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M68HC11K Family
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