MC68HC11G5 Datasheet, PDF (63/195 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller

Freescale Semiconductor, Inc.
1B
YES
I BIT
IN CCR
SET ?
NO
ANY I BIT
INTERRUPT
YES
PENDING
?
NO
STACK CPU
REGISTERS
SET X AND I BITS
FETCH VECTOR
$FFF8, FFF9
FETCH OPCODE
NO
LEGAL
OPCODE
?
YES
YES
WAI ?
NO
STACK CPU
REGISTERS
STACK CPU
REGISTERS
STACK CPU
YES
REGISTERS
SET X AND I BITS
FETCH VECTOR
$FFF6, FFF7
YES
RESTORE CPU
REGISTERS
FROM STACK
SWI ?
NO
RTI ?
NO
EXECUTE THIS
INSTRUCTION
NO
INTERRUPT
YET ?
YES
SET I BIT
RESOLVE INTERRUPT
PRIORITY AND FETCH
VECTOR FOR HIGHEST
PENDING SOURCE
(SEE FIGURE 5-3)
START NEXT
1A _INSTRUCTION
SEQUENCE
Figure 5-2. Processing Flow out of Resets (contd)
RESETS, INTERRUPTS AND LOW POWER MODES
5-11
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