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PIC18F4685-E Datasheet, PDF (411/484 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology | |||
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PIC18F2682/2685/4682/4685
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 â [ 0, 1, 2 ]
FSRf â k â FSRf
None
1110 1001 ffkk kkkk
The 6-bit literal âkâ is subtracted from
the contents of the FSR specified
by âfâ.
1
1
Q2
Read
register âfâ
Q3
Process
Data
Q4
Write to
destination
Example:
SUBFSR 2, 23h
Before Instruction
FSR2 = 03FFh
After Instruction
FSR2 = 03DCh
SUBULNK Subtract Literal from FSR2 and Return
Syntax:
SUBULNK k
Operands:
0 ⤠k ⤠63
Operation:
FSR2 â k â FSR2,
(TOS) â PC
Status Affected: None
Encoding:
1110 1001
11kk
kkkk
Description: The 6-bit literal âkâ 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
â11â); it operates only on FSR2.
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Decode
No
Operation
Q2
Read
register âfâ
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)
© 2007 Microchip Technology Inc.
Preliminary
DS39761B-page 409
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