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PIC16C925T-S/CL 数据表(PDF) 128 Page - Microchip Technology

部件名 PIC16C925T-S/CL
功能描述  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

PIC16C925T-S/CL 数据表(HTML) 128 Page - Microchip Technology

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PIC16C925/926
DS39544A-page 126
Preliminary
 2001 Microchip Technology Inc.
RETFIE
Return from Interrupt
Syntax:
[ label ]
RETFIE
Operands:
None
Operation:
TOS
→ PC,
1
→ GIE
Status Affected:
None
Encoding:
00
0000
0000
1001
Description:
Return from Interrupt. Stack is POPed
and Top-of-Stack (TOS) is loaded in
the PC. Interrupts are enabled by set-
ting Global Interrupt Enable bit, GIE
(INTCON<7>). This is a two-cycle
instruction.
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
1st Cycle
Decode
No
Operation
Set the
GIE bit
Pop from
the Stack
2nd Cycle
No
Operation
No
Operation
No
Operation
No
Operation
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
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
Q Cycle Activity:
Q1
Q2
Q3
Q4
1st Cycle
Decode
Read
literal ’k’
No
Operation
Write to W,
Pop from
the Stack
2nd Cycle
No
Operation
No
Operation
No
Operation
No
Operation
Example
CALL TABLE ;W contains table
;offset value
;W now has table value
•
•
TABLE 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



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