MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 68

• Manufacturer Part Number: MC68HC908GR4
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Resets and Interrupts
Technical Data
68
NOTE:
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
INT1
INT2
Go to: www.freescale.com
Figure 4-5
Resets and Interrupts
CLI
LDA
PSHH
PULH
RTI
PSHH
PULH
RTI
.
#$FF
Interrupt Recognition Example
INT1 INTERRUPT SERVICE ROUTINE
INT2 INTERRUPT SERVICE ROUTINE
MC68HC908GR8 — Rev 4.0
BACKGROUND
ROUTINE
MOTOROLA