PIC16LC71 datasheet(73/176 Pages) MICROCHIP

73 / 176 page

DS30272A-page 73

PIC16C71X

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 '0' then the next

instruction is executed.

If bit 'b' is '1', then the next instruction is

discarded and a NOP is executed

instead, making this a 2TCY instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

Decode

Read

Process

data

NOP

If Skip:

(2nd Cycle)

NOP

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

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:

Q Cycle Activity:

1st Cycle

Decode

Read

literal 'k',

Push PC

to Stack

Process

data

Write to

2nd Cycle

NOP

Example

HERE

CALL

THERE

Before Instruction

PC = Address HERE

After Instruction

PC = Address THERE

TOS = Address HERE+1

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