Maxim Integrated MAXQ610 - Manual (Page 185)

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MAXQ610 User’s Guide
RET S
Operation: S=1: IP ← @SP--
S=0: IP ← IP + 1
Encoding: 15 0
1100 1100 0000 1101
Example(s): RET S ; S=0, return (RET) does not occur
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 acknowl-
edge additional interrupts .
Status Flags: None
Operation:
IP ← @SP--
IPS ← 11b
Encoding: 15 0
1000 1100 1000 1101
Example(s): see RET
RETI C/RETI NC
RETI Z/RETI NZ
RETI S
Conditional Return from Interrupt on Status Flag
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
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 acknowl-
edge additional interrupts .
Status Flags: None
Operation:
C=1: IP ← @SP--
IPS ← 11b
C=0: IP ← IP + 1
Encoding: 15 0
1010 1100 1000 1101
Example(s): RETI C ; C=1, return from interrupt (RETI) is performed .