參數(shù)資料
型號: 25C256
廠商: Microchip Technology Inc.
英文描述: 256K 5.0V SPI Bus Serial EEPROM(4.5~5.5V,256K位,SPI總線串行EEPROM)
中文描述: 256K 5.0V SPI總線串行EEPROM(4.5?5.5V的,256K位和SPI總線串行EEPROM的)
文件頁數(shù): 119/170頁
文件大小: 4191K
代理商: 25C256
2003 Microchip Technology Inc.
Preliminary
DS40300C-page 117
PIC16F62X
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
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
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
RLF
Rotate Left f through Carry
Syntax:
[
label
]
RLF f,d
Operands:
0
f
127
d
[0,1]
Operation:
See description below
Status Affected:
C
Encoding:
00
1101
dfff
ffff
Description:
The contents of register 'f' are
rotated one bit to the left through
the Carry Flag. If 'd' is 0 the result
is placed in the W register. If 'd' is
1 the result is stored back in
register 'f'.
Words:
1
Cycles:
1
Example
RLF
REG1, 0
Before Instruction
REG1
= 1110 0110
C
= 0
After Instruction
REG1
= 1110 0110
W
= 1100 1100
C
= 1
REGISTER F
C
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