55
MC95FG308 / MC95FG208
ABOV Semiconductor Co., Ltd.
10.6 Effective Timing after Controlling Interrupt bit
Figure 10.4
Interrupt Enable Register effective Timing
10.7 Multi Interrupt
If two requests of different priority levels are received simultaneously, the request of higher priority level is serviced. If
requests of the interrupt are received at the same time simultaneously, an interrupt polling sequence determines by
hardware which request is serviced. However, multiple processing through software for special features is possible.
Figure 10.5
Execution of Multi Interrupt
Following example is shown to service INT0 routine during INT1 routine in Figure 10 6. In this example, INT0 interrupt
priority is higher than INT1 interrupt priority. If some interrupt is lower than INT1 priority, it can’t service its interrupt
routine.
Main Program
Service
Occur
INT1 Interrupt
INT1 ISR
Enable INT0
Disable others
Occur
INT0 Interrupt
INT0 ISR
RETI
RETI
Enable INT0
Enable others
Interrupt Enable Register
command
Next Instruction
Next Instruction
Setting both EA bit and individual interrupt
enable bit INTnE makes the pending interrupt
active after executing the next instruction.
Содержание MC95FG208 Series
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