Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 335)

100

101

19-21 _________________________________________________________________________________________________________

MAXQ7667 User’s Guide

RET Return from Subroutine

Description:

RET pops a single word from the stack (@SP) into the Instruction Pointer (IP) and decrements the stack pointer (SP).

The decremented SP is saved as the new stack pointer (SP).

Status Flags: None

Operation: IP ← @ SP--

Encoding: 15 0

Example(s): RET

Code Execution:

Stack Data:

← SP (before RET)

← SP (after RET)

RET C/RET NC, RET Z/RET NZ, RET S Conditional Return on Status Flag

Description: Performs conditional return (RET) based upon the state of a specific processor status flag. RET C returns if the Carry

flag is set while RET NC returns if the Carry flag is clear. RET Z returns if the Zero flag is set while RET NZ returns if

the Zero flag is clear. RET S returns if the Sign flag is set. See RET for additional information on the return operation.

Status Flags: None

RET C C=1: IP ← @SP--

Operation: C=0: IP ← IP + 1

Encoding: 15 0

Example(s): RET C ; C=1, return (RET) is performed

1010

1100

0000

1101

1000

1100

0000

1101

Addr (IP)

Op Code

0311h • • •

0312h RET

0103h • • •

xxxxh

0103h

xxxxh

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