MC68HC11E0CFNE2 Datasheet, PDF(92/242 Page) Freescale Semiconductor, Inc – M68HC11 CPU, Power-saving stop and wait modes, Low-voltage devices available (3.0–5.5 Vdc)

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MC68HC11E0CFNE2 Datasheet, PDF (92/242 Pages) Freescale Semiconductor, Inc – M68HC11 CPU, Power-saving stop and wait modes, Low-voltage devices available (3.0–5.5 Vdc)

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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

Y

SWI

INSTRUCTION?

N

FETCH VECTOR

$FFF6, $FFF7

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

SEE FIGURE 5â2

1A

Figure 5-5. Processing Flow Out of Reset (Sheet 2 of 2)

M68HC11E Family Data Sheet, Rev. 5.1

92

Freescale Semiconductor

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