[ label ] RETFIE [s] Operands: s " />
鍙冩暩璩囨枡
鍨嬭櫉锛� PIC18F2539-E/SP
寤犲晢锛� Microchip Technology
鏂囦欢闋佹暩锛� 162/322闋�
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC PIC MCU FLASH 12KX16 28DIP
妯欐簴鍖呰锛� 15
绯诲垪锛� PIC® 18F
鏍稿績铏曠悊鍣細 PIC
鑺珨灏哄锛� 8-浣�
閫熷害锛� 40MHz
閫i€氭€э細 I²C锛孲PI锛孶ART/USART
澶栧湇瑷倷锛� 娆犲妾㈡脯/寰╀綅锛孡VD锛孭OR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁革細 21
绋嬪簭瀛樺劜鍣ㄥ閲忥細 24KB锛�12K x 16锛�
绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 闁冨瓨
EEPROM 澶у皬锛� 256 x 8
RAM 瀹归噺锛� 1408 x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 4.2 V ~ 5.5 V
鏁告摎杞夋彌鍣細 A/D 5x10b
鎸暕鍣ㄥ瀷锛� 鍏ч儴
宸ヤ綔婧害锛� -40°C ~ 125°C
灏佽/澶栨锛� 28-DIP锛�0.300"锛�7.62mm锛�
鍖呰锛� 绠′欢
閰嶇敤锛� DVA18XP280-ND - DEVICE ADAPTER 18F2220 PDIP 28LD
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PIC18FXX39
DS30485A-page 242
Preliminary
2002 Microchip Technology Inc.
RETFIE
Return from Interrupt
Syntax:
[ label ] RETFIE [s]
Operands:
s
鈭� [0,1]
Operation:
(TOS)
鈫� PC,
1
鈫� GIE/GIEH or PEIE/GIEL,
if s = 1
(WS)
鈫� W,
(STATUSS)
鈫� STATUS,
(BSRS)
鈫� BSR,
PCLATU, PCLATH are unchanged.
Status Affected:
GIE/GIEH, PEIE/GIEL.
Encoding:
0000
0001
000s
Description:
Return from Interrupt. Stack is
popped and Top-of-Stack (TOS) is
loaded into the PC. Interrupts are
enabled by setting either the high
or low priority global interrupt
enable bit. If 鈥榮鈥� = 1, the contents of
the shadow registers WS,
STATUSS and BSRS are loaded
into their corresponding registers,
W, STATUS and BSR. If 鈥榮鈥� = 0, no
update of these registers occurs
(default).
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
No
operation
pop PC from
stack
Set GIEH or
GIEL
No
operation
No
operation
No
operation
No
operation
Example:
RETFIE
1
After Interrupt
PC
=
TOS
W=
WS
BSR
=
BSRS
STATUS
=
STATUSS
GIE/GIEH, PEIE/GIEL
=
1
RETLW
Return Literal to W
Syntax:
[ label ] RETLW k
Operands:
0
鈮� k 鈮� 255
Operation:
k
鈫� W,
(TOS)
鈫� PC,
PCLATU, PCLATH are unchanged
Status Affected:
None
Encoding:
0000
1100
kkkk
Description:
W is loaded with the eight-bit literal
'k'. The program counter is loaded
from the top of the stack (the return
address). The high address latch
(PCLATH) remains unchanged.
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal 'k'
Process
Data
pop PC from
stack, Write
to W
No
operation
No
operation
No
operation
No
operation
Example:
CALL TABLE ; W contains table
; offset value
; W now has
; table value
:
TABLE
ADDWF PCL
; W = offset
RETLW k0
; Begin table
RETLW k1
;
:
RETLW kn
; End of table
Before Instruction
W
=
0x07
After Instruction
W
=
value of kn
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