PIC16F57 Microchip Technology Inc., PIC16F57 Datasheet - Page 53

• Manufacturer Part Number: PIC16F57
• Description: Flash-based, 8-bit Cmos Microcontroller Series
• Manufacturer: Microchip Technology Inc.

SUBWF
Syntax:
Operands:
Operation:
Status Affected: C, DC, Z
Encoding:
Description:
Words:
Cycles:
Example 1:
Example 2:
Example 3:
© 2007 Microchip Technology Inc.
Before Instruction
After Instruction
Before Instruction
After Instruction
After Instruction
REG1
W
C
REG1
W
C
REG1
W
C
REG1
W
C
Before Instruction
REG1
W
C
REG1
W
C
Subtract (2’s complement method)
Subtract W from f
[ label ] SUBWF f, d
0 ≤ f ≤ 31
d ∈ [0,1]
(f) – (W) → (dest)
the W register from register ‘f’. If ‘d’
is ‘0’, the result is stored in the W
register. If ‘d’ is ‘1’, the result is
stored back in register ‘f’.
1
1
SUBWF
0000
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
3
2
?
1
2
1
2
2
?
0
2
1
1
2
?
0xFF
2
0
10df
REG1, 1
; result is positive
; result is zero
; result is negative
ffff
SWAPF
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
Words:
Cycles:
Example:
TRIS
Syntax:
Operands:
Operation:
Status Affected: None
Encoding:
Description:
Words:
Cycles:
Example:
Before Instruction
After Instruction
Before Instruction
After Instruction
REG1
REG1
W
W
TRISB
Swap Nibbles in f
[ label ] SWAPF f, d
0 ≤ f ≤ 31
d ∈ [0,1]
(f<3:0>) → (dest<7:4>);
(f<7:4>) → (dest<3:0>)
The upper and lower nibbles of
register ‘f’ are exchanged. If ‘d’ is
‘0’, the result is placed in W
register. If ‘d’ is ‘1’, the result is
placed in register ‘f’.
1
1
SWAPF REG1, 0
=
=
Load TRIS Register
[ label ] TRIS
f = 5, 6, 7, 8 or 9
(W) → TRIS register f
TRIS register ‘f’ (f = 5, 6 or 7) is
loaded with the contents of the W
register.
1
1
TRIS
0011
0000
=
=
=
0xA5
0xA5
0xA5
0xA5
0x5A
PORTB
10df
PIC16F5X
0000
DS41213D-page 51
f
ffff
0fff