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PIC18F4520E/MLQTP Datasheet(PDF) 315 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 315 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS39631A-page 313
PIC18F2420/2520/4420/4520
SUBFSR
Subtract Literal from FSR
Syntax:
SUBFSR f, k
Operands:
0
≤ k ≤ 63
f
∈ [ 0, 1, 2 ]
Operation:
FSR(f) – k
→ FSRf
Status Affected:
None
Encoding:
1110
1001
ffkk
kkkk
Description:
The 6-bit literal ‘k’ is subtracted from
the contents of the FSR specified by
‘f’.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
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 – k
→ FSR2
(TOS)
→ PC
Status Affected: None
Encoding:
1110
1001
11kk
kkkk
Description:
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.
Words:
1
Cycles:
2
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write to
destination
No
Operation
No
Operation
No
Operation
No
Operation
Example:
SUBULNK 23h
Before Instruction
FSR2
=
03FFh
PC
=
0100h
After Instruction
FSR2
=
03DCh
PC
=
(TOS)



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