PIC16C84A datasheet(57/117 Pages) MICROCHIP

57 / 117 page

DS30081F-page 57

PIC16C8X

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 2 cycle

instruction.

Words:

Cycles:

1(2)

Example

HERE

FALSE

TRUE

BTFSC

GOTO

•

FLAG,1

PROCESS_CODE

Before Instruction

PC =

address

HERE

After Instruction

if FLAG<1>=0,

PC=address

FALSE

if FLAG<1>=1,

PC=address

TRUE

CALL

Subroutine Call

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:

Subroutine call. 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

PC =

Address HERE

After Instruction

PC =

Address THERE

TOS =

Address HERE

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

FLAG_REG

Before Instruction

FLAG_REG

0x5A

After Instruction

FLAG_REG

0x00

CLRW

Clear W Register

Syntax:

[

label ] CLRW

Operands:

None

Operation:

00h

→ (W)

→ Z

Status Affected:

Encoding:

0001

0xxx

xxxx

Description:

W register is cleared. Zero bit (Z) is

set.

Words:

Cycles:

Example

CLRW

Before Instruction

0x5A

After Instruction

0x00

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