mc68hc908gt8 Freescale Semiconductor, Inc, mc68hc908gt8 Datasheet - Page 142

• Manufacturer Part Number: mc68hc908gt8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Resets and Interrupts
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.
142
To maintain compatibility with the M6805 Family, the H register is not
pushed on the stack during interrupt entry. If the interrupt service routine
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
YES
INSTRUCTION
INSTRUCTION
INSTRUCTION
FETCH NEXT
INTERRUPTS
FROM RESET
INTERRUPT
INTERRUPT
INTERRUPT
I BIT SET?
I BIT SET?
OTHER
BREAK
IRQ
RTI
ICG
SWI
?
?
?
?
?
?
NO
NO
NO
NO
NO
NO
NO
Figure 13-6. Interrupt Processing
YES
YES
YES
YES
YES
YES
NOTE
LOAD PC WITH INTERRUPT VECTOR
UNSTACK CPU REGISTERS
STACK CPU REGISTERS
EXECUTE INSTRUCTION
SET I BIT
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