PIC16F84A-04B/SS Просмотр технического описания (PDF) - Microchip Technology

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производитель

PIC16F84A-04B/SS

18-pin Flash/EEPROM 8-Bit Microcontrollers

Microchip Technology 

PIC16F8X

BTFSS

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

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 '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.

1

1(2)

Q1

Q2

Q3

Q4

Decode Read Process No-Operat

register 'f' data

ion

If Skip:

(2nd Cycle)

Q1

Q2

Q3

Q4

No-Operati No-Opera No-Operat

No-Operat on

tion

ion

ion

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:

0 ≤ k ≤ 2047

Operation:

(PC)+ 1→ TOS,

k → PC<10:0>,

(PCLATH<4:3>) → PC<12:11>

Status Affected: None

Encoding:

10 0kkk kkkk 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:

1

Cycles:

2

Q Cycle Activity: Q1 Q2

Q3

Q4

1st Cycle

Decode

Read

literal 'k',

Push PC

to Stack

Process

data

Write to

PC

2nd Cycle

No-Opera No-Opera No-Operat

No-Opera tion

tion

ion

tion

Example

HERE CALL THERE

Before Instruction

PC = Address HERE

After Instruction

PC = Address THERE

TOS = Address HERE+1

© 1998 Microchip Technology Inc.

DS30430C-page 57

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