DP80390 datasheet(69/84 Pages) DCD

部品番号	DP80390

部品情報	Pipelined High Performance Microcontroller Instructions set details ver 3.10

PDF	84 Pages

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メーカー	DCD [Digital Core Design]

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DP80390 Instructions set details

- 69 -

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3.33.

RETI *

3.33.1.

LARGE

Function:

Return from interrupt

Description:

RETI pops the PC successively from the stack, and restores the

interrupt logic to accept additional interrupts at the same priority level as

the one just processed. The stack pointer is left decremented by two.

No other registers are affected; the PSW is not automatically restored to

its pre-interrupt status. Program execution continues at the resulting

address, which is generally the instruction immediately after the point at

which the interrupt request was detected. If a lower or same-level

interrupt is pending when the RETI instruction is executed, that one

instruction will be executed before the pending interrupt is processed.

Operation:

(PC15-8)

← ((SP))

(SP)

← (SP) - 1

(PC7-0)

← ((SP))

(SP)

← (SP) - 1

Bytes:

Cycles:

Encoding:

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