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PIC17C752-08/CL 데이터시트(PDF) 219 Page - Microchip Technology

부품명 PIC17C752-08/CL
상세설명  High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D
PDF  328 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC17C752-08/CL 데이터시트(HTML) 219 Page - Microchip Technology

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© 1998 Microchip Technology Inc.
DS30289A-page 219
PIC17C7XX
RETFIE
Return from Interrupt
Syntax:
[
label ]
RETFIE
Operands:
None
Operation:
TOS
→ (PC);
0
→ GLINTD;
PCLATH is unchanged.
Status Affected:
GLINTD
Encoding:
0000
0000
0000
0101
Description:
Return from Interrupt. Stack is POP’ed
and Top of Stack (TOS) is loaded in the
PC. Interrupts are enabled by clearing
the GLINTD bit. GLINTD is the global
interrupt disable bit (CPUSTA<4>).
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
No
operation
Clear
GLINTD
POP PC
from stack
No
operation
No
operation
No
operation
No
operation
Example:
RETFIE
After Interrupt
PC
=
TOS
GLINTD =
0
RETLW
Return Literal to WREG
Syntax:
[
label ]
RETLW k
Operands:
0
≤ k ≤ 255
Operation:
k
→ (WREG); TOS → (PC);
PCLATH is unchanged
Status Affected:
None
Encoding:
1011
0110
kkkk
kkkk
Description:
WREG 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
WREG
No
operation
No
operation
No
operation
No
operation
Example:
CALL TABLE ; WREG contains table
;
offset value
;
WREG now has
;
table value
:
TABLE
ADDWF PC
; WREG = offset
RETLW k0
; Begin table
RETLW k1
;
:
:
RETLW kn
; End of table
Before Instruction
WREG
=
0x07
After Instruction
WREG
=
value of k7



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