參數(shù)資料
型號: PIC16C621-20/SS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO20
封裝: 0.209 INCH, PLASTIC, MO-150, SSOP-20
文件頁數(shù): 90/121頁
文件大?。?/td> 1202K
代理商: PIC16C621-20/SS
PIC16C62X
DS30235H-page 70
1999 Microchip Technology Inc.
OPTION
Load Option Register
Syntax:
[
label ]
OPTION
Operands:
None
Operation:
(W)
→ OPTION
Status Affected:
None
Encoding:
00
0000
0110
0010
Description:
The contents of the W register are
loaded in the OPTION register.
This instruction is supported for
code compatibility with PIC16C5X
products. Since OPTION is a read-
able/writable register, the user can
directly address it.
Words:
1
Cycles:
1
Example
To maintain upward compatibility
with future PICmicro products, do
not use this instruction.
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 Inter-
rupt 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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