參數(shù)資料
型號: PIC16C622T-20I/SO
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO18
封裝: 0.300 INCH, PLASTIC, MS-013, SO-18
文件頁數(shù): 99/128頁
文件大小: 3677K
代理商: PIC16C622T-20I/SO
PIC16C62X
DS30235J-page 70
2003 Microchip Technology Inc.
RETFIE
Return from Interrupt
Syntax:
[ label ]
RETFIE
Operands:
None
Operation:
TOS
→ PC,
1
→ GIE
Status Affected:
None
Encoding:
00
0000
1001
Description:
Return from Interrupt. Stack is
POPed and Top of Stack (TOS) is
loaded in the PC. Interrupts are
enabled by setting Global
Interrupt Enable bit, GIE
(INTCON<7>). This is a two-cycle
instruction.
Words:
1
Cycles:
2
Example
RETFIE
After Interrupt
PC =
TOS
GIE =
1
RETLW
Return with Literal in W
Syntax:
[ label ]
RETLW k
Operands:
0
≤ k ≤ 255
Operation:
k
→ (W);
TOS
→ PC
Status Affected:
None
Encoding:
11
01xx
kkkk
Description:
The W register is loaded with the
eight bit literal 'k'. The program
counter is loaded from the top of
the stack (the return address).
This is a two-cycle instruction.
Words:
1
Cycles:
2
Example
TABLE
CALL TABLE;W contains
table
;offset value
;W now has table value
ADDWF PC
;W = offset
RETLW k1
;Begin table
RETLW k2
;
RETLW kn
; End of table
Before Instruction
W=
0x07
After Instruction
W
=
value of k8
RETURN
Return from Subroutine
Syntax:
[ label ]
RETURN
Operands:
None
Operation:
TOS
→ PC
Status Affected:
None
Encoding:
00
0000
1000
Description:
Return from subroutine. The stack
is POPed and the top of the stack
(TOS) is loaded into the program
counter. This is a two-cycle
instruction.
Words:
1
Cycles:
2
Example
RETURN
After Interrupt
PC =
TOS
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