FS91M68 datasheet(22/24 Pages) FORTUNE

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FS91M68

RLF

Rotate left [f] through Carry

Syntax:

RLF

f, d

≤ f ≤ FFh

∈ [0,1]

Operation:

[Destination<n+1>]

← [f<n>]

[Destination<0>]

← C

← [f<7>]

Flag Affected:

C, Z

Description:

[f] is rotated one bit to the left

through the Carry bit. If d is 0,

the result is stored in the W

stored back in [f].

Cycle:

Example:

RLF

OPERAND, 1

Before instruction:

C = 0

W = 88h, OPERAND = E6h

After instruction:

C = 1

W = 88h, OPERAND =

CCh

RRF

Rotate right [f] through Carry

Syntax:

RRF

f, d

≤ f ≤ FFh

∈ [0,1]

Operation:

[Destination<n-1>]

← [f<n>]

[Destination<7>]

← C

← [f<7>]

Flag Affected:

Description:

[f] is rotated one bit to the right

through the Carry bit. If d is 0,

the result is stored in the W

stored back in [f].

Cycle:

Example:

RRF

OPERAND, 0

Before instruction:

C = 0

OPERAND = 95h

After instruction:

C = 1

W = 4Ah, OPERAND = 95h

SLEEP

Oscillator stop

Syntax:

SLEEP

Operation:

CPU oscillator is stopped

Flag Affected:

Description:

CPU oscillator is stopped. CPU

can be waked up by external

interrupt sources.

Cycle:

Example:

SLEEP

After instruction:

PD = 1

TO = 0

If WDT causes wake up, TO

= 1

Please make sure all interrupt flags are cleared

before running SLEEP; "NOP" command must

follow HALT and SLEEP commands.

SUBLW

Subtract W from literal

Syntax:

SUBLW

≤ k ≤ FFh

Operation:

[W]

← k – [W]

Flag Affected:

C, DC, Z

Description:

Subtract the content of the W

"k". The result is stored in the W

Cycle:

Example 1:

SUBLW

02H

Before instruction:

W = 01h

After instruction:

W = 01h

C = 1

Z = 0

Example 2:

SUBLW

02H

Before instruction:

W = 02h

After instruction:

W = 00h

C = 1

Z = 1

Example 3:

SUBLW

02H

Before instruction:

W = 03h

After instruction:

W = FFh

C = 0

Z = 0

SUBWF

Subtract W from f

Syntax:

SUBWF

f, d

≤ f ≤ FFh

∈ [0,1]

Operation:

[Destination]

← [f] – [W]

Flag Affected:

C, DC, Z

Description:

Subtract the content of the W

result is stored in the W register.

If d is 1, the result is stored back

in [f],

Cycle:

Example 1:

SUBWF

OPERAND, 1

Before instruction:

OPERAND = 33h, W = 01h

After instruction:

OPERAND = 32h

C = 1

Z = 0

Example 2:

SUBWF

OPERAND, 1

Before instruction:

OPERAND = 01h, W = 01h

After instruction:

OPERAND = 00h

C = 1

Z = 1

Example 3:

SUBWF

OPERAND, 1

Before instruction:

OPERAND = 04h, W = 05h

After instruction:

OPERAND = FFh

C = 0

Z = 0

Rev. 1.3

22/24

FS91M68 Datasheet(PDF) 22 Page - Fortune Semiconductor Corp.

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