PIC18LF8410-I/PTQTP View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC18LF8410-I/PTQTP Datasheet PDF : 404 Pages
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PIC18F6310/6410/8310/8410
SUBFSR
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Subtract Literal from FSR
SUBFSR f, k
0 ≤ k ≤ 63
f ∈ [ 0, 1, 2 ]
FSRf – k → FSRf
None
1110 1001 ffkk kkkk
The 6-bit literal ‘k’ is subtracted from
the contents of the FSR specified by
‘f’.
1
1
Q2
Read
register ‘f’
Q3
Process
Data
Q4
Write to
destination
Example:
SUBFSR 2, 23h
Before Instruction
FSR2 = 03FFh
After Instruction
FSR2 = 03DCh
SUBULNK
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
No
Operation
Subtract Literal from FSR2
and Return
SUBULNK k
0 ≤ k ≤ 63
FSR2 – k → FSR2
(TOS) → PC
None
1110 1001 11kk kkkk
The 6-bit literal ‘k’ is subtracted from
the contents of the FSR2. A RETURN
is then executed by loading the PC
with the TOS.
The instruction takes two cycles to
execute; a NOP is performed during
the second cycle.
This may be though of as a special
case of the SUBFSR instruction,
where f = 3 (binary ‘11’); it operates
only on FSR2.
1
2
Q2
Read
register ‘f’
No
Operation
Q3
Process
Data
No
Operation
Q4
Write to
destination
No
Operation
Example:
SUBULNK 23h
Before Instruction
FSR2 = 03FFh
PC
= 0100h
After Instruction
FSR2 =
PC
=
03DCh
(TOS)
2004 Microchip Technology Inc.
Preliminary
DS39635A-page 333
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