Interrupt Recognition Example - Motorola MC68HC908GP32 Technical Data Manual

NOTE:
MC68HC908GP32 MC68HC08GP32
•
MOTOROLA
Freescale Semiconductor, Inc.
CLI
LDA
INT1
PSHH
PULH
RTI
INT2
PSHH
PULH
RTI
Figure 4-5
The LDA opcode is prefetched by both the INT1 and INT2 RTI
instructions. However, in the case of the INT1 RTI prefetch, this is a
redundant operation.
To maintain compatibility with the M6805 Family, the H register is not
pushed on the stack during interrupt entry. If the interrupt service routine
modifies the H register or uses the indexed addressing mode, save the
H register and then restore it prior to exiting the routine.
Rev. 6
—
Resets and Interrupts
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INT1 INTERRUPT SERVICE ROUTINE
INT2 INTERRUPT SERVICE ROUTINE
.

Interrupt Recognition Example

Resets and Interrupts
Interrupts
BACKGROUND
ROUTINE
Technical Data
77