參數(shù)資料
型號： M30101M3-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PDSO42
封裝： PLASTIC, SSOP-42
文件頁數(shù)： 72/125頁
文件大小： 1608K
代理商： M30101M3-XXXFP
Under
development
Tentative Specifications REV.C1
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30101/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Interrupts
50
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 1.12.8 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 1.12.9 shows the interrupt resolution circuit.
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