參數(shù)資料
型號(hào): M30201M4-114FP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機(jī)
文件頁數(shù): 41/159頁
文件大小: 2319K
代理商: M30201M4-114FP
Unde
Interrupts
deeopmen
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
41
Returning from an Interrupt Routine
Executing the REIT instruction at the end of an interrupt routine returns the contents of the flag register
(FLG) as it was immediately before the start of interrupt sequence and the contents of the program
counter (PC), both of which have been saved in the stack area. Then control returns to the program that
was being executed before the acceptance of the interrupt request, so that the suspended process re-
sumes.
Return the other registers saved by software within the interrupt routine using the POPM or similar in-
struction before executing the REIT instruction.
Interrupt Priority
If there are two or more interrupt requests occurring at a point in time within a single sampling (checking
whether interrupt requests are made), the interrupt assigned a higher priority is accepted.
Assign an arbitrary priority to maskable interrupts (peripheral I/O interrupts) using the interrupt priority
level select bit. If the same interrupt priority level is assigned, however, the interrupt assigned a higher
hardware priority is accepted.
Priorities of the special interrupts, such as Reset (dealt with as an interrupt assigned the highest priority),
watchdog timer interrupt, etc. are regulated by hardware.
Figure 1.29 shows the priorities of hardware interrupts.
Software interrupts are not affected by the interrupt priority. If an instruction is executed, control branches
invariably to the interrupt routine.
Interrupt Priority Level Judge Circuit
This circuit selects the interrupt with the highest priority level when two or more interrupts are generated
simultaneously.
Figure 1.30 shows the interrupt resolution circuit.
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