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UPD17218CT Datasheet(PDF) 45 Page - NEC

Part # UPD17218CT
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
PDF  84 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17218CT Datasheet(HTML) 45 Page - NEC

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µPD17215, 17216, 17217, 17218
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7.3.2
Returning from interrupt processing routine
To return from an interrupt processing routine, use the RETI instruction.
Then the following processing is 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 been finished, the EI instruction must be executed
immediately before the RETI instruction.
Accepting the interrupt is enabled by the EI instruction after the instruction next to the EI instruction has been
executed. Therefore, the interrupt is not accepted between the EI and RETI instructions.



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