PIC18F1220ESLASHPQTP datasheet(208/308 Pages) MICROCHIP

208 / 308 page

PIC18F1220/1320

DS39605F-page 206

Branch if Zero

Syntax:

[ label ] BZ

Operands:

-128

≤ n ≤ 127

Operation:

if Zero bit is ‘1’

(PC) + 2 + 2n

→ PC

Status Affected:

None

Encoding:

1110

0000

nnnn

Description:

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.

Words:

Cycles:

1(2)

Q Cycle Activity:

If Jump:

Decode

Read literal

‘n’

Process

Data

Write to PC

operation

If No Jump:

Decode

Read literal

‘n’

Process

Data

operation

Example:

HERE

Jump

Before Instruction

address (HERE)

After Instruction

If Zero

address (Jump)

If Zero

address (HERE + 2)

CALL

Subroutine Call

Syntax:

[ label ] CALL k [,s]

Operands:

≤ k ≤ 1048575

∈ [0,1]

Operation:

(PC) + 4

→ TOS,

→ 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>)

1110

1111

110s

k19kkk

k7kkk

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:

Cycles:

Q Cycle Activity:

Decode

Read literal

‘k’<7:0>,

Push PC to

stack

Read literal

‘k’<19:8>,

Write to PC

operation

Example:

HERE

CALL

THERE, FAST

Before Instruction

address (HERE)

After Instruction

address (THERE)

TOS

address (HERE + 4)

BSRS

BSR

STATUSS =

Status

PIC18F1220E/PQTP Datasheet(PDF) 208 Page - Microchip Technology

PIC18F1220E/PQTP Datasheet(HTML) 208 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL