PIC16F648AESS 查看數據表（PDF） - Microchip Technology

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PIC16F648AESS

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

BTFSS

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Bit Test f, Skip if Set

[ label ] BTFSS f,b

0 ≤ f ≤ 127

0≤b<7

skip if (f<b>) = 1

None

01

11bb bfff ffff

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.

1

1(2)

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

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Call Subroutine

[ label ] CALL k

0 ≤ k ≤ 2047

(PC)+ 1→ TOS,

k → PC<10:0>,

(PCLATH<4:3>) → PC<12:11>

None

10

0kkk kkkk kkkk

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.

1

2

HERE CALL THERE

Before Instruction

PC = Address HERE

After Instruction

PC = Address THERE

TOS = Address HERE+1

CLRF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example

Clear f

[ label ] CLRF f

0 ≤ f ≤ 127

00h → (f)

1→Z

Z

00

0001 1fff ffff

The contents of register ‘f’ are

cleared and the Z bit is set.

1

1

CLRF REG1

Before Instruction

REG1 = 0x5A

After Instruction

REG1 = 0x00

Z

=1

© 2007 Microchip Technology Inc.

DS40044F-page 119

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