PIC18F8520-IPT301 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F8520-IPT301

64/80-Pin High-Performance, 256 Kbit to 1 MbitEnhanced Flash Microcontrollers with A/D

Microchip Technology 

PIC18F6520/8520/6620/8620/6720/8720

BZ

Branch if Zero

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

[ label ] BZ n

-128  n  127

if Zero bit is ‘1’

(PC) + 2 + 2n  PC

None

1110 0000 nnnn nnnn

If the Zero bit is ‘1’, then the

program 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.

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:

Operands:

Operation:

[ label ] CALL k [,s]

0  k  1048575

s [0,1]

(PC) + 4  TOS,

k  PC<20:1>,

if s = 1

(W)  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 2-Mbyte

memory range. First, return

address (PC+ 4) is pushed onto the

return stack. If ‘s’ = 1, the W,

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

Q3

Q4

Decode

No

operation

Read literal

‘k’<7:0>

No

operation

Push PC to

stack

No

operation

Read literal

‘k’<19:8>,

Write to PC

No

operation

Example:

HERE

CALL THERE,1

Before Instruction

PC

= address (HERE)

After Instruction

PC

=

TOS

=

WS

=

BSRS =

STATUSS =

address (THERE)

address (HERE + 4)

W

BSR

STATUS

DS39609C-page 274

 2003-2013 Microchip Technology Inc.

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