Datasheet

PIC16C55X
DS40143E-page 64 Preliminary  1996-2013 Microchip Technology Inc.
SUBWF Subtract W from f
Syntax: [ label ] SUBWF f,d
Operands: 0 f 127
d  [0,1]
Operation: (f) - (W) dest)
Status
Affected:
C, DC, Z
Encoding:
00 0010 dfff ffff
Description:
Subtract (2’s complement method)
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'.
Words: 1
Cycles: 1
Example 1:
SUBWF REG1,1
Before Instruction
REG1 = 3
W=2
C=?
After Instruction
REG1 = 1
W=2
C = 1; result is positive
Example 2: Before Instruction
REG1 = 2
W=2
C=?
After Instruction
REG1 = 0
W=2
C = 1; result is zero
Example 3: Before Instruction
REG1 = 1
W=2
C=?
After Instruction
REG1 = 0xFF
W=2
C = 0; result is negative
SWAPF Swap Nibbles in f
Syntax: [ label ] SWAPF f,d
Operands: 0  f  127
d  [0,1]
Operation: (f<3:0>)  (dest<7:4>),
(f<7:4>)  (dest<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
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
products. Since TRIS registers are
readable and writable, the user can
directly address them.
Words: 1
Cycles: 1
Example
To maintain upward compatibility
with future PIC MCU products, do
not use this instruction.