參數(shù)資料
型號: MC68HC05P4ADWR3
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 32/102頁
文件大?。?/td> 930K
代理商: MC68HC05P4ADWR3
MC68HC05P4A — Rev. 6.0
Advance Information
MOTOROLA
Interrupts
35
Advance Information — MC68HC05P4A
Section 4. Interrupts
4.1 Contents
4.2 Introduction
The MCU can be interrupted four different ways:
Two maskable hardware interrupts, IRQ and timer
Non-maskable software interrupt instruction (SWI)
Optional external asynchronous interrupt on each port A pin
(enabled by pullup mask option)
Interrupts cause the processor to save register contents on the stack
and to set the interrupt mask (I bit) to prevent additional interrupts. The
return to interrupt (RTI) instruction causes the register contents to be
recovered from the stack and normal processing to resume.
Unlike RESET, hardware interrupts do not cause the current instruction
execution to be halted, but are considered pending until the current
instruction is complete.
NOTE:
The current instruction is the one already fetched and being operated on.
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