PIC16LC74AT-10/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC74AT-10/SO

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C7X

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 Process Write to

register 'f' data destination

Example 1:

Example 2:

Example 3:

SUBWF REG1,1

Before Instruction

REG1

W

C

Z

=3

=2

=?

=?

After Instruction

REG1

W

C

Z

=1

=2

= 1; result is positive

=0

Before Instruction

REG1

W

C

Z

=2

=2

=?

=?

After Instruction

REG1

W

C

Z

=0

=2

= 1; result is zero

=1

Before Instruction

REG1

W

C

Z

=1

=2

=?

=?

After Instruction

REG1

W

C

Z

= 0xFF

=2

= 0; result is negative

=0

SWAPF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Swap Nibbles in f

[ label ] SWAPF f,d

0 ≤ f ≤ 127

d ∈ [0,1]

(f<3:0>) → (destination<7:4>),

(f<7:4>) → (destination<3:0>)

None

00 1110 dfff ffff

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

Q1

Q2

Q3

Q4

Decode Read Process Write to

register 'f' data destination

Example

SWAPF REG, 0

Before Instruction

REG1 =

After Instruction

REG1 =

W

=

0xA5

0xA5

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.

© 1997 Microchip Technology Inc.

DS30390E-page 161

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