參數(shù)資料
型號: M306H3FCFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP116
封裝: 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116
文件頁數(shù): 90/135頁
文件大小: 2583K
代理商: M306H3FCFP
Rev.1.00
2004.03.23
page 58 of 320
M306H3MC-XXXFP/FCFP
2.7.2 Software Interrupts
A software interrupt occurs when executing certain instructions. Software interrupts are non-maskable
interrupts.
Undefined Instruction Interrupt
An undefined instruction interrupt occurs when executing the UND instruction.
Overflow Interrupt
An overflow interrupt occurs when executing the INTO instruction with the O flag set to “1” (the opera-
tion resulted in an overflow). The following are instructions whose O flag changes by arithmetic:
ABS, ADC, ADCF, ADD, CMP, DIV, DIVU, DIVX, NEG, RMPA, SBB, SHA, SUB
BRK Interrupt
A BRK interrupt occurs when executing the BRK instruction.
INT Instruction Interrupt
An INT instruction interrupt occurs when executing the INT instruction. Software interrupt Nos. 0 to 63
can be specified for the INT instruction. Because software interrupt Nos. 4 to 31 are assigned to
peripheral function interrupts, the same interrupt routine as for peripheral function interrupts can be
executed by executing the INT instruction.
In software interrupt Nos. 0 to 31, the U flag is saved to the stack during instruction execution and is
cleared to “0” (ISP selected) before executing an interrupt sequence. The U flag is restored from the
stack when returning from the interrupt routine. In software interrupt Nos. 32 to 63, the U flag does not
change state during instruction execution, and the SP then selected is used.
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