Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 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