PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 533

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

SUBFSR
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
 2011 Microchip Technology Inc.
Q Cycle Activity:
Before Instruction
After Instruction
Decode
FSR2
FSR2
Q1
=
=
register ‘f’
Subtract Literal from FSR
SUBFSR f, k
0  k  63
f  [ 0, 1, 2 ]
FSRf – k  FSRf
None
The 6-bit literal ‘k’ is subtracted from
the contents of the FSR specified
by ‘f’.
1
1
SUBFSR 2, 23h
Read
1110
Q2
03FFh
03DCh
1001
Process
Data
Q3
ffkk
destination
Write to
kkkk
Q4
Preliminary
PIC18F66K80 FAMILY
SUBULNK
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
Before Instruction
After Instruction
Operation
Decode
No
FSR2
PC
FSR2
PC
Q1
Subtract Literal from FSR2 and Return
SUBULNK k
0  k  63
FSR2 – k  FSR2,
(TOS)  PC
None
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 thought of as a special case
of the SUBFSR instruction, where f = 3
(binary ‘ 11 ’); it operates only on FSR2.
1
2
=
=
=
=
1110
Operation
register ‘f’
SUBULNK 23h
Read
No
Q2
03FFh
0100h
03DCh
(TOS)
1001
Operation
Process
Data
No
Q3
DS39977C-page 533
11kk
destination
Operation
Write to
kkkk
No
Q4