參數(shù)資料
型號(hào)： 16F84A
廠商： Microchip Technology Inc.
英文描述： CAT 5E CROSSOVER PATCH CORD CABLE BLUE 20 FT
中文描述： 18引腳閃存/ EEPROM的8位微控制器
文件頁數(shù)： 64/124頁
文件大?。?/td> 1322K
代理商： 16F84A
PIC16F8X
DS30430C-page 64
1998 Microchip Technology Inc.
RETLW
Syntax:
Operands:
Operation:
Return with Literal in W
[ label RETLW k
0
≤
k
≤
255
k
→
(W);
TOS
→
PC
None
Status Affected:
Encoding:
Description:
11
01xx
kkkk
kkkk
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.
1
2
Q1
Q2
Words:
Cycles:
Q Cycle Activity:
Q3
Q4
1st Cycle
Decode
Read
literal 'k'
No-Opera
tion
Write to W,
Pop from
the Stack
2nd Cycle
No-Operat
ion
No-Opera
tion
No-Opera
tion
No-Operat
ion
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
=
After Instruction
W
=
0x07
value of k8
RETURN
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Return from Subroutine
[ label RETURN
None
TOS
→
PC
None
00
0000
0000
1000
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.
1
2
Q1
Q2
Words:
Cycles:
Q Cycle Activity:
Q3
Q4
1st Cycle
Decode
No-Opera
tion
No-Opera
tion
Pop from
the Stack
2nd Cycle
No-Operat
ion
No-Opera
tion
No-Opera
tion
No-Opera
tion
Example
RETURN
After Interrupt
PC =
TOS
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