PIC1F628 datasheet(113/170 Pages) MICROCHIP

113 / 170 page

 2003 Microchip Technology Inc.

Preliminary

DS40300C-page 111

PIC16F62X

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

instruction fetched during the

current instruction execution, is

discarded and a NOP is executed

instead, making this a two-cycle

instruction.

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

immediate 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

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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