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PIC16F84A-10/SS Datasheet(PDF) 67 Page - Microchip Technology

Part # PIC16F84A-10/SS
Description  18-pin Flash/EEPROM 8-Bit Microcontrollers
PDF  124 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F84A-10/SS Datasheet(HTML) 67 Page - Microchip Technology

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PIC16F8X
© 1998 Microchip Technology Inc.
DS30430C-page 67
SUBWF
Subtract W from f
Syntax:
[
label ]
SUBWF f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f) - (W)
→ (destination)
Status Affected:
C, DC, Z
Encoding:
00
0010
dfff
ffff
Description:
Subtract (2’s complement method) W reg-
ister 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'.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process
data
Write to
destination
Example 1:
SUBWF
REG1,
1
Before Instruction
REG1
=
3
W
=
2
C
=
?
Z
=
?
After Instruction
REG1
=
1
W
=
2
C
=
1; result is positive
Z
=
0
Example 2:
Before Instruction
REG1
=
2
W
=
2
C
=
?
Z
=
?
After Instruction
REG1
=
0
W
=
2
C
=
1; result is zero
Z
=
1
Example 3:
Before Instruction
REG1
=
1
W
=
2
C
=
?
Z
=
?
After Instruction
REG1
=
0xFF
W
=
2
C
=
0; result is negative
Z
=
0
SWAPF
Swap Nibbles in f
Syntax:
[
label ] SWAPF f,d
Operands:
0
≤ f ≤ 127
d
∈ [0,1]
Operation:
(f<3:0>)
→ (destination<7:4>),
(f<7:4>)
→ (destination<3:0>)
Status Affected:
None
Encoding:
00
1110
dfff
ffff
Description:
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'.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process
data
Write to
destination
Example
SWAPF
REG,
0
Before Instruction
REG1
=
0xA5
After Instruction
REG1
=
0xA5
W
=
0x5A
TRIS
Load TRIS Register
Syntax:
[
label]
TRIS
f
Operands:
5
≤ f ≤ 7
Operation:
(W)
→ TRIS register f;
Status Affected: None
Encoding:
00
0000
0110
0fff
Description:
The instruction is supported for code
compatibility with the PIC16C5X prod-
ucts. Since TRIS registers are read-
able and writable, the user can directly
address them.
Words:
1
Cycles:
1
Example
To maintain upward compatibility
with future PIC16CXX products,
do not use this instruction.



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