16F648 datasheet(121/180 Pages) MICROCHIP

121 / 180 page

DS40044G-page 121

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

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 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

Z= 1

16F648 Datasheet(PDF) 121 Page - Microchip Technology

16F648 Datasheet(HTML) 121 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL