PIC18F4520ESLASHMLQTP datasheet(304/390 Pages) MICROCHIP

304 / 390 page

PIC18F2420/2520/4420/4520

DS39631A-page 302

Preliminary

 2004 Microchip Technology Inc.

SLEEP

Enter Sleep mode

Syntax:

SLEEP

Operands:

None

Operation:

00h

→ WDT,

→ WDT postscaler,

→ TO,

→ PD

Status Affected:

TO, PD

Encoding:

0000

0011

Description:

The Power-down status bit (PD) is

cleared. The Time-out status bit (TO)

is set. Watchdog Timer and its

postscaler are cleared.

The processor is put into Sleep mode

with the oscillator stopped.

Words:

Cycles:

Q Cycle Activity:

Decode

operation

Process

Data

Go to

Sleep

Example:

SLEEP

Before Instruction

TO =?

PD =?

After Instruction

TO =1 †

PD =0

† If WDT causes wake-up, this bit is cleared.

SUBFWB

Subtract f from W with borrow

Syntax:

SUBFWB

f {,d {,a}}

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(W) – (f) – (C)

→ dest

Status Affected:

N, OV, C, DC, Z

Encoding:

0101

01da

ffff

Description:

Subtract register ‘f’ and CARRY flag

(borrow) from W (2’s complement

method). If ‘d’ is ‘0’, the result is stored

in W. If ‘d’ is ‘1’, the result is stored in

If ‘a’ is ‘0’, the Access Bank is

selected. If ‘a’ is ‘1’, the BSR is used

to select the GPR bank (default).

If ‘a’ is ‘0’ and the extended instruction

set is enabled, this instruction

operates in Indexed Literal Offset

Addressing mode whenever

≤ 95 (5Fh). See Section 24.2.3

“Byte-Oriented and Bit-Oriented

Instructions in Indexed Literal Offset

Mode” for details.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Process

Data

Write to

destination

Example 1:

SUBFWB

REG, 1, 0

Before Instruction

REG

After Instruction

REG

; result is negative

Example 2:

SUBFWB

REG, 0, 0

Before Instruction

REG

After Instruction

REG

; result is positive

Example 3:

SUBFWB

REG, 1, 0

Before Instruction

REG

After Instruction

REG

; result is zero

PIC18F4520E/MLQTP Datasheet(PDF) 304 Page - Microchip Technology

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