PIC18F010T-I/SN 데이터 시트보기 (PDF) - Microchip Technology

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PIC18F010T-I/SN

High Performance Microcontrollers

Microchip Technology 

PIC18F010/020

BZ

Branch if Zero

Syntax:

[ label ] BZ n

Operands:

-128 ≤ n ≤ 127

Operation:

if Zero bit is ’1’

(PC) + 2 + 2n → PC

Status Affected: None

Encoding:

1110 0000 nnnn nnnn

Description:

If the Zero bit is ’1’, then the pro-

gram will branch.

The 2’s complement number ’2n’ is

added to the PC. Since the PC will

have incremented to fetch the next

instruction, the new address will be

PC+2+2n. This instruction is then

a two-cycle instruction.

Words:

1

Cycles:

1(2)

Q Cycle Activity:

If Jump:

Q1

Q2

Decode

Read literal

’n’

No

operation

No

operation

If No Jump:

Q1

Q2

Decode

Read literal

’n’

Q3

Process

Data

No

operation

Q3

Process

Data

Q4

Write to PC

No

operation

Q4

No

operation

Example:

HERE

Before Instruction

PC

=

After Instruction

If Zero

=

PC

=

If Zero

=

PC

=

BZ Jump

address (HERE)

1;

address (Jump)

0;

address (HERE+2)

CALL

Subroutine Call

Syntax:

[ label ] CALL k [,s]

Operands:

0 ≤ k ≤ 1048575

s ∈ [0,1]

Operation:

(PC) + 4 → TOS,

k → PC<20:1>,

if s = 1

(WREG) → WS,

(STATUS) → STATUSS,

(BSR) → BSRS

Status Affected: None

Encoding:

1st word (k<7:0>) 1110

2nd word(k<19:8>) 1111

110s k7kkk

k19kkk kkkk

kkkk0

kkkk8

Description:

Subroutine call of entire 2M byte

memory range. First, return

address (PC+ 4) is pushed onto the

return stack. If ’s’ = 1, the WREG,

STATUS and BSR registers are

also pushed into their respective

shadow registers, WS, STATUSS

and BSRS. If 's' = 0, no update

occurs (default). Then the 20-bit

value ’k’ is loaded into PC<20:1>.

CALL is a two-cycle instruction.

Words:

2

Cycles:

2

Q Cycle Activity:

Q1

Q2

Decode

Read literal

’k’<7:0>,

No

operation

No

operation

Q3

Push PC to

stack

No

operation

Q4

Read literal

’k’<19:8>,

Write to PC

No

operation

Example:

HERE

CALL THERE, FAST

Before Instruction

PC

= Address(HERE)

After Instruction

PC

=

TOS =

WS

=

BSRS =

STATUSS =

Address(THERE)

Address (HERE + 4)

WREGREG

BSR

STATUS

DS41142A-page 110

Preliminary

 2001 Microchip Technology Inc.

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