PIC16C925T-SSLASHCL datasheet(120/182 Pages) MICROCHIP

120 / 182 page

PIC16C925/926

DS39544A-page 118

Preliminary

 2001 Microchip Technology Inc.

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 instruc-

tion is discarded and a NOP is exe-

cuted instead, making this a 2TCY

instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

Decode

Read

Process

data

Operation

If Skip:

(2nd Cycle)

Operation

Example

HERE

FALSE

TRUE

BTFSC

GOTO

•

FLAG,1

PROCESS_CODE

Before Instruction:

address HERE

After Instruction:

if FLAG<1> =

address FALSE

if FLAG<1> =

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

Operation

Example

HERE

CALL

THERE

Before Instruction:

= Address HERE

After Instruction:

= Address THERE

TOS

= Address HERE+1

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