參數資料
型號: UPD1724x
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS
中文描述: 4位單片微控制器的小型通用兩用紅外遙控遞質
文件頁數: 67/102頁
文件大?。?/td> 461K
代理商: UPD1724X
67
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
8.3.2
Returning from interrupt processing routine
To return from an interrupt processing routine, use the RETI instruction.
The following processing is then executed within an instruction cycle.
Loads contents of interrupt
stack register to PSWORD
Increments value of stack pointer by 1
Loads contents of stack addressed by
stack pointer to program counter
To enable an interrupt after the processing of an interrupt has finished, the EI instruction must be executed
immediately before the RETI instruction.
Interrupt acknowledgement is enabled by the EI instruction after the instruction next to the EI instruction
has been executed. Therefore, the interrupt is not acknowledged between the EI and RETI instructions.
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