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MAXQ7667 User’s Guide

RETI Return from Interrupt

Description:

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

Additionally, RETI returns the interrupt logic to a state in which it can acknowledge additional interrupts.

Status Flags: None

Operation: IP ← @SP--

INS

← 0

Encoding: 15 0

Example(s): See RETI

RETI C/RETI NC, RETI Z/RETI NZ, RETI S Conditional Return from Interrupt on Status Flag

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

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

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

Status Flags: None

RETI C

Operation:

C=1: IP ← @SP--

INS

← 0

C=0: IP

← IP + 1

Encoding: 15 0

Example(s): RETI C ; C=1, return from interrupt (RETI) is performed

RETI NC

Operation:

C=0: IP ← @SP--

INS

← 0

C=1: IP

← IP +1

Encoding: 15 0

Example(s): RETI NC ; C=1, return from interrupt (RETI) does not occur

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Maxim-integrated MAXQ7667 Manual de usuario Pagina 337