mc68hc908lb8 Freescale Semiconductor, Inc, mc68hc908lb8 Datasheet - Page 167

• Manufacturer Part Number: mc68hc908lb8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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.
See
16.3.2 Sources
The sources in
Freescale Semiconductor
Figure 16-5
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.
Table 16-1
for a flowchart depicting interrupt processing.
INT1
INT2
can generate CPU interrupt requests.
Figure 16-4
CLI
LDA
PSHH
PULH
RTI
PSHH
PULH
RTI
MC68HC908LB8 Data Sheet, Rev. 1
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.
Interrupt Recognition Example
NOTE
INT1 INTERRUPT SERVICE ROUTINE
INT2 INTERRUPT SERVICE ROUTINE
BACKGROUND
ROUTINE
Interrupts
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