Maxim-integrated DS4830 Optical Microcontroller Instrukcja Użytkownika Pobierz pdf (Strona 210)

DS4830 User’s Guide

210

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

1000

1100

1000

1101

Example(s): see RET

RETI C / RETI NC Conditional Return from Interrupt on Status Flag

RETI Z / RETI NZ

RETI S

Description: Performs conditional return from interrupt (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 from interrupt

operation.

Status Flags: None

RETI C

Operation: C=1: IP  @SP--

INS 0

C=0: IP  IP + 1

Encoding: 15 0

1010

1100

1000

1101

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

1110

1100

1000

1101

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

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