Campbell 21X Instrukcja Operatora Pobierz pdf (Strona 129)

N

12.

PROGRAM

CONTROL

INSTRUCTIONS

Flag 0

Flag 1 to 8

Flag 9

12-1.

Flag

Description

Output

Flag

User

Flags

I ntermediate

Processing Disable

Flag

Instruction

95, END. Allsubroutines

must be

placed

in Table

3

(Subroutine

Table).

When a

subroutine

is called by a command

in a Program

Control

Instruction,

the

subroutine

is execuled,

then

program

flow continues

with the instruction

following that which called

the subroutine.

Subroutines

cannot

be

embedded

within other

subroutines;

a

subroutine

must end

before the

next one begins. Subroutines

may be

called

from within other subroutines

(nested).

The

maximum

nesting level for subroutines

is 7

deep.

Attempts

to

nest more than

7 deep

will

not be

detected

at

compilation,

but

will result

in

a

run time error. When the

seventh subroutine

attempts to

callthe

eighth,

error

31 will be

displayed.

Execution will not branch

to the

eighth subroutine;

it will continue

with the

lnstruction

following

that

calling the

subroutine.

PAR.

DATA

NO.

TYPE DESCRIPTION

01

: 2

Subroutine

number

(1-9,

77-99)

***

86

DO

***

FUNCTION

This

instruction

unconditionally

executes

the

specified

command.

PAR. DATA

NO.

TYPE DESCRIPTION

01:

2

Command

(Table

12-2)

***

87

LOOP

***

FUNCTION

Instructions included

between

the Loop

lnstruction

and

the

End Instruction

(95)

are

repeated the number of

times specified

by the

iteration

count

(Parameter

2), or

until an

Exit

Loop command

(31,

32) is executed

by

a

Program

Control Instruction

within the

Loop. lf 0

is entered

for

the

count, the

loop

is repeated

until an

Exit Loop command

is

executed.

The

first

parameter,

delay,

controls

how

frequently

passes

through

the

loop are

made.

The delay unit

is

the

table execution

interval:

TABILE 12-2.

Command Codes

0-

1-9,

77-99

1

0-tr9

20-49

g0

31

32

41-46

51-q6

61

Go

to end of

program

table

Call Subroutine

1

-9,

77-99

Set Flag 0-9

high

Set Flag 0-9low

Then Do

Exit loop if true

Exit loop if false

Setport1-6high

Setportl-6low

Toggleport1-6

the

fixed

value is less, the

next

is executed. See

lnstruction

93

71-

g3

lFcAsE

x<F

*"*

FUNCTION

lnstruction

tests

the

value

in an

input

location

specified

in Begin

Case

Instruction

93.

A

series of

ions 83 are used to compare

the

value

in input

location to ever

increasing

fixed

lf the value

in the location

is less

value entered as

Parameter

1,

than the

then the

mand in

Parameter 2 is executed

and

when

execution

next

Instruction 83

is

encountered

to the end of the

case

statement.

lnstruction

01:

02:

for an

PARAM.

NUMBER

DESCRIPTION

Fixed value

Command

***

85 LABEL

SUBROUTINE

This instruc{on

marks the start

of a subroutine.

A subroutind

is a series

of

instructions beginning

FP

2

with

Instructlon

85 and

terminated

with

12-1

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 190 191

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