参数资料
型号: UPD178F054
英文描述: 78K/0 Series for Instructions | User's Manual[10/2001]
中文描述: 78K线/ 0系列说明|用户手册[10/2001]
文件页数: 127/129页
文件大小: 644K
代理商: UPD178F054
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
97
User's Manual U12326EJ4V0UM
Break
BRK
Software Vectored Interrupt
[Instruction format]
BRK
[Operation]
(SP–1)
← PSW,
(SP–2)
← (PC+1)H,
(SP–3)
← (PC+1)L,
IE
← 0,
SP
← SP–3,
PCH
← (3FH),
PCL
← (3EH)
[Operand]
None
[Flag]
ZAC
CY
[Description]
This is a software interrupt instruction.
PSW and the next instruction address (PC+1) are saved to the stack. After that, the IE flag is cleared (0)
and the saved data is branched to the address indicated with the word data at the vector address (003EH).
Because the IE flag is cleared (0), the subsequent maskable vectored interrupts are disabled.
The RETB instruction is used to return from the software vectored interrupt generated with this instruction.
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