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17 Software Programming
JetWeb
3. Loading by double indirect addressing
JetSym
REGISTER_LOAD (rVoltage, @@rVPointer)
JetSym ST
rVoltage := @@rVPointer;
The value of the register, the number of which is specified in the
register rVPointer, is loaded into register rVoltage.
4. Double Indirect Addressing: Numerical example
Register Number
Value
REG 64
111
REG 111
70035
REG 150
11
REG 11
Any value
This example will be carried out using the following instruction:
JetSym
REGISTER_LOAD (@150, @@64)
JetSym ST
VAR
pDestination: INT AT %VL 150;
pSource: INT AT %VL 64;
END_VAR;
@pDestination := @pSource;
This instruction results in the following register values and the graphic
representation shown in Fig. 42:
Register 64 = 111
remains unchanged
Register 111 = 70035
remains unchanged
Register 150 = 11
remains unchanged
Register 11 = @150
112
= @@64 =
@111 = 70035
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