PIC16F5X datasheet(53/88 Pages) MICROCHIP

53 / 88 page

DS41213D-page 51

PIC16F5X

SUBWF

Subtract W from f

Syntax:

[ label ] SUBWF f, d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

(f) – (W)

→ (dest)

Status Affected:

C, DC, Z

Encoding:

0000

10df

ffff

Description:

Subtract (2’s complement method)

the W register from register ‘f’. If ‘d’

is ‘0’, the result is stored in the W

stored back in register ‘f’.

Words:

Cycles:

Example 1:

SUBWF

REG1, 1

Before Instruction

REG1

After Instruction

REG1

; result is positive

Example 2:

Before Instruction

REG1

After Instruction

REG1

; result is zero

Example 3:

Before Instruction

REG1

After Instruction

REG1

0xFF

; result is negative

SWAPF

Swap Nibbles in f

Syntax:

[ label ] SWAPF f, d

Operands:

≤ f ≤ 31

∈ [0,1]

Operation:

(f<3:0>)

→ (dest<7:4>);

(f<7:4>)

→ (dest<3:0>)

Status Affected:

None

Encoding:

0011

10df

ffff

Description:

The upper and lower nibbles of

‘0’, the result is placed in W

placed in register ‘f’.

Words:

Cycles:

Example:

SWAPF

REG1,

Before Instruction

REG1

0xA5

After Instruction

REG1

0xA5

0x5A

TRIS

Load TRIS Register

Syntax:

[ label ] TRIS

Operands:

f = 5, 6, 7, 8 or 9

Operation:

(W)

→ TRIS register f

Status Affected:

None

Encoding:

0000

0fff

Description:

TRIS register ‘f’ (f = 5, 6 or 7) is

loaded with the contents of the W

Words:

Cycles:

Example:

TRIS

PORTB

Before Instruction

0xA5

After Instruction

TRISB

0xA5

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