16F628 datasheet(117/168 Pages) MICROCHIP

117 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 115

PIC16F627A/628A/648A

BTFSS

Bit Test f, Skip if Set

Syntax:

[

label ] BTFSS f,b

Operands:

≤ f ≤ 127

≤ b < 7

Operation:

skip if (f<b>) = 1

Status Affected:

None

Encoding:

11bb

bfff

ffff

Description:

If bit 'b' in register 'f' is '1' then the

next instruction is skipped.

If bit 'b' is '1', then the next instruc-

tion fetched during the current

instruction execution, is discarded

and a

NOP is executed instead,

making this a two-cycle instruc-

tion.

Words:

Cycles:

1(2)

Example

HERE

FALSE

TRUE

BTFSS

GOTO

•

REG1

PROCESS_CODE

Before Instruction

PC = address

HERE

After Instruction

if FLAG<1> = 0,

PC =

address

FALSE

if FLAG<1> = 1,

PC =

address

TRUE

CALL

Call Subroutine

Syntax:

[

label ] CALL k

Operands:

≤ k ≤ 2047

Operation:

(PC)+ 1

→ TOS,

→ PC<10:0>,

(PCLATH<4:3>)

→ PC<12:11>

Status Affected:

None

Encoding:

0kkk

kkkk

Description:

Call Subroutine. First, return

address (PC+1) is pushed onto

the stack. The eleven bit imme-

diate address is loaded into PC

bits <10:0>. The upper bits of

the PC are loaded from

PCLATH.

CALL is a two-cycle

instruction.

Words:

Cycles:

Example

HERE

CALL

THERE

Before Instruction

Address

HERE

After Instruction

Address

THERE

TOS =

Address

HERE+1

CLRF

Clear f

Syntax:

[

label ] CLRF f

Operands:

≤ f ≤ 127

Operation:

00h

→ (f)

→ Z

Status Affected:

Encoding:

0001

1fff

ffff

Description:

The contents of register 'f' are

cleared and the Z bit is set.

Words:

Cycles:

Example

CLRF

REG1

Before Instruction

REG1

0x5A

After Instruction

REG1

0x00

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