16F628 datasheet(125/168 Pages) MICROCHIP

125 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 123

PIC16F627A/628A/648A

SUBWF

Subtract W from f

Syntax:

[

label ]

SUBWF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - (W)

→ (dest)

Status

Affected:

C, DC, Z

Encoding:

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

Words:

Cycles:

Example 1:

SUBWF

REG1, 1

Before Instruction

REG1 = 3

W= 2

C= ?

After Instruction

REG1 = 1

W= 2

= 1; result is positive

= DC = 1

Example 2:

Before Instruction

REG1 = 2

W= 2

C= ?

After Instruction

REG1 = 0

W= 2

= 1; result is zero

= DC = 1

Example 3:

Before Instruction

REG1 = 1

W= 2

C= ?

After Instruction

REG1 = 0xFF

W= 2

= 0; result is negative

= DC = 0

SWAPF

Swap Nibbles in f

Syntax:

[

label ]

SWAPF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f<3:0>)

→ (dest<7:4>),

(f<7:4>)

→ (dest<3:0>)

Status Affected:

None

Encoding:

1110

dfff

ffff

Description:

The upper and lower nibbles of

0 the result is placed in W regis-

ter. If 'd' is 1 the result is placed in

Words:

Cycles:

Example

SWAPF

REG1, 0

Before Instruction

REG1 = 0xA5

After Instruction

REG1 =

0xA5

0x5A

TRIS

Load TRIS Register

Syntax:

[

label ] TRIS

Operands:

≤ f ≤ 7

Operation:

(W)

→ TRIS register f;

Status Affected:

None

Encoding:

0000

0110

0fff

Description:

The instruction is supported for

code compatibility with the

PIC16C5X products. Since TRIS

registers are readable and writ-

able, the user can directly

address them.

Words:

Cycles:

Example

To maintain upward compatibil-

ity with future PICmicro® prod-

ucts, do not use this

instruction.

16F628 Datasheet(PDF) 125 Page - Microchip Technology

16F628 Datasheet(HTML) 125 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL