Maxim Integrated MAXQ7667 - Manual (Page 337)

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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
1000 1100 1000 1101
1010 1100 1000 1101
1110 1100 1000 1101