PIC16CR83 Datasheet

IC型号：
PIC16CR83
PDF描述：
18-pin Flash/EEPROM 8-Bit Microcontrollers
文件大小：
2018.18KB
PDF页数：
125页
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PIC16F8X

SUBWF

Syntax:

Operands:

Operation:

Encoding:

Description:

Subtract W from f

[

label

]

鈮?/div>

127

鈭?/div>

[0,1]

(f) - (W)

鈫?(destination)

0010

dfff

ffff

SUBWF f,d

SWAPF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Swap Nibbles in f

[

label

] SWAPF f,d

鈮?/div>

127

鈭?/div>

[0,1]

(f<3:0>)

鈫?/div>

(destination<7:4>),

(f<7:4>)

鈫?/div>

(destination<3:0>)

None

Status Affected: C, DC, Z

Subtract (2鈥檚 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'.

1110

dfff

ffff

Words:

Cycles:

Q Cycle Activity:

Decode

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:

Read

Decode

Process

data

Write to

destination

Cycles:

Q Cycle Activity:

Read

Process

data

Write to

destination

Example 1:

SUBWF

Before Instruction

REG1

REG1,1

Example

SWAPF REG,

Before Instruction

REG1

0xA5

After Instruction

REG1

0xA5

0x5A

After Instruction

REG1

1; result is positive

Example 2:

Before Instruction

REG1

TRIS

Syntax:

Operands:

Operation:

Encoding:

Description:

Load TRIS Register

[label]

鈮?/div>

(W)

鈫?/div>

TRIS register f;

TRIS

After Instruction

REG1

1; result is zero

Status Affected: None

0000

0110

0fff

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.

Example 3:

Before Instruction

REG1

Words:

Cycles:

Example

To maintain upward compatibility

with future PIC16CXX products,

do not use this instruction.

After Instruction

REG1

0xFF

0; result is negative

漏

1998 Microchip Technology Inc.

DS30430C-page 67

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