Remote-processing BASIC for the CX-10 Modbus Manuel d'utilisateur télécharger pdf (Page 37)

BASIC PROGRAMMING GUIDE

2-28

LD@

Syntax: LD@

expr

Where:

expr

= valid integer address of 00H through 0FFFFH (65535)

Function: Retrieves a floating-point number previously saved with ST@

Mode: Command, run

Use: LD@3000

DESCRIPTION

LD@ is used in conjunction with PUSH, POP, and ST@. Use these commands to save and retrieve floating

point numbers to program RAM.

NOTE:

LD@ and ST@ cannot use extended RAM. Only segment 0 RAM (used for running Basic

programs) is used. Use PEEKF and POKEF commands to access this memory.

WARNING:

When 128K and 512K RAM are installed, all of memory is cleared on power up and reset.

Do not use LD@ or ST@ to save floating point numbers in segment 0. Use POKE and

PEEK type commands instead.

32K RAM systems have address 7E00H set as MTOP. This location up to 7FFFH may be used to store

variables.

expr

is the address in RAM of where a number is stored.

Each floating-point number requires six bytes of memory.

expr

in the ST@ and LD@ instructions specify the

high address. A number is stored at locations

expr

through

expr-6

ST@, PUSH, POP, PEEKF POKEF

ERROR

BAD ARGUMENT when

expr

> 65535

EXAMPLE

100 A=REGREAD(9)*.007234

110 PUSH A

120 ST@7F00H

300 LD@7F00H

310 POP B

320 PRINT "Analog value retrieved=",B

>run

Analog value retrieved=",B

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 83 84

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Remote-processing BASIC for the CX-10 Modbus Manuel d'utilisateur Page 37

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