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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