參數(shù)資料
型號: MC68HC08LT8
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 43/156頁
文件大?。?/td> 1030K
代理商: MC68HC08LT8
Exception Control
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
43
Figure 4-10. Interrupt Processing
4.5.1.1 Hardware Interrupts
A hardware interrupt does not stop the current instruction. Processing of a hardware interrupt begins after
completion of the current instruction. When the current instruction is complete, the SIM checks all pending
hardware interrupts. If interrupts are not masked (I bit clear in the condition code register) and if the
corresponding interrupt enable bit is set, the SIM proceeds with interrupt processing; otherwise, the next
instruction is fetched and executed.
If more than one interrupt is pending at the end of an instruction execution, the highest priority interrupt is
serviced first.
Figure 4-11
demonstrates what happens when two interrupts are pending. If an interrupt is
pending upon exit from the original interrupt service routine, the pending interrupt is serviced before the
LDA instruction is executed.
NO
NO
NO
YES
NO
NO
YES
YES
AS MANY INTERRUPTS
AS EXIST ON CHIP
I BREAK
INTERRUPT
FROM RESET
I-BIT SET
IRQ
INTERRUPT
SWI
INSTRUCTION
RTI
INSTRUCTION
FETCH NEXT
INSTRUCTION
UNSTACK CPU REGISTERS
STACK CPU REGISTERS
SET I-BIT
LOAD PC WITH INTERRUPT VECTOR
EXECUTE INSTRUCTION
YES
YES
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