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DM163006 Datasheet(PDF) 253 Page - Microchip Technology

Part # DM163006
Description  High-Performance ROM-less Microcontrollers
PDF  320 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DM163006 Datasheet(HTML) 253 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Advance Information
DS39541A-page 253
PIC18C601/801
SUBWFB
Subtract WREG from f with
Borrow
Syntax:
[ label ] SUBWFB f [,d [,a]]
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(f) – (WREG) – (C)
→ dest
Status Affected:
N,OV, C, DC, Z
Encoding:
0101
10da
ffff
ffff
Description:
Subtract WREG and the carry flag
(borrow) from register 'f' (2’s com-
plement method). If 'd' is 0, the
result is stored in WREG. If 'd' is 1,
the result is stored back in register
'f' (default). If ’a’ is 0, the Access
Bank will be selected, overriding
the BSR value. If ’a’ is 1, the Bank
will be selected as per the BSR
value.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ’f’
Process
Data
Write to
destination
SUBWFB (Cont.)
Example 1:
SUBWFB
REG
Before Instruction
REG
=
19h
(0001 1001)
WREG
=
0Dh
(0000 1101)
C=
1
After Instruction
REG
=
0Ch
(0000 1011)
WREG
=
0Dh
(0000 1101)
C=
1
Z=
0
N
=
0
; result is positive
Example 2:
SUBWFB
REG, W
Before Instruction
REG
=
1Bh
(0001 1011)
WREG
=
1Ah
(0001 1010)
C=
0
After Instruction
REG
=
1Bh
(0001 1011)
WREG
=
00h
C=
1
Z
=
1
; result is zero
N=
0
Example 3:
SUBWFB
REG
Before Instruction
REG
=
03h
(0000 0011)
WREG
=
0Eh
(0000 1101)
C=
1
After Instruction
REG
=
0F5h
(1111 0100) [2’s comp]
WREG
=
0Eh
(0000 1101)
C=
0
Z=
0
N
=
1
; result is negative



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