Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 228)

MAXQ612/MAXQ622 User’s Guide

16-18 Maxim Integrated

RET S

Operation:

S=1: IP ← @SP--

S=0: IP ← IP + 1

Encoding:

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:

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:

1010 1100 1000 1101

Example(s):

RETI C ; C=1, return from interrupt (RETI) is performed.

1 2 ... 223 224 225 226 227 228 229 230 231 232 233 ... 254 255

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