PIC18LF448T-E/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF448T-E/SO

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

BZ

Branch if Zero

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

[ 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 instruc-

tion, the new address will be

PC + 2 + 2n. This instruction is then a

two-cycle instruction.

Words:

Cycles:

Q Cycle Activity:

If Jump:

Q1

Decode

No

operation

If No Jump:

Q1

Decode

1

1(2)

Q2

Read literal

‘n’

No

operation

Q2

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

(W) → WS,

(Status) → STATUSS,

(BSR) → BSRS

Status Affected: None

Encoding:

1st word (k<7:0>)

2nd word(k<19:8>)

Description:

1110 110s k7kkk kkkk0

1111 k19kkk kkkk kkkk8

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

Decode

No

operation

Q2

Read literal

‘k’<7:0>,

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

=

After Instruction

PC

=

TOS =

WS

=

BSRS =

STATUSS=

address (HERE)

address (THERE)

address (HERE + 4)

W

BSR

Status

DS41159E-page 296

© 2006 Microchip Technology Inc.

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