Zilog Z8F0130 Instrukcja Użytkownika Pobierz pdf (Strona 222)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 RET Instruction

207

RET

Definition

Return.

Syntax

RET

Operation



@SP





SP + 2

Description

This instruction returns from a procedure entered by a CALL instruction.

The contents of the location addressed by the Stack Pointer are loaded

into the Program Counter. The next statement executed is the one

addressed by the new contents of the Program Counter. The Stack Pointer

also increments by two.

Flags

Any PUSH instruction executed within the subroutine must be countered

with a POP instruction to guarantee the Stack Pointer is at the correct

location when the RET instruction is executed. Otherwise, the wrong

address loads into the Program Counter and the program cannot oper-

ate properly.

C Unaffected

Z Unaffected

S Unaffected

V Unaffected

D Unaffected

H Unaffected

Note:

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