Table of Contents - TG Drives
Table of Contents - TG Drives
Table of Contents - TG Drives
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EXTENDED REGISTER GROUPS<br />
STACK HANDLING<br />
Group Group<br />
No.<br />
Description<br />
Stack handling<br />
Stack 1 The register bank, Stack, is a circular stack that can<br />
accommodate 64 register values, 32 bits wide. Since<br />
the stack is circular, there is no error trap when<br />
pushing the 65th number on the stack; however, the<br />
1st number is overwritten.<br />
GENERAL<br />
The stack group consists <strong>of</strong> 64 registers (32 bit) that can be used by the application<br />
program for temporary storage <strong>of</strong> data. The function is circular when data is taken<br />
(poped) from the stack and linear when data is pushed onto the stack. The system<br />
uses the stack for temporary storage <strong>of</strong> interrupt masks when Int.Mode = 1.<br />
FUNCTION<br />
Data is placed onto the stack with the PUSH statement where the argument can be<br />
a register or a constant. Data is taken from the stack with the POP statement<br />
where the argument must be a register.<br />
The value in Stack.63 is lost when a PUSH statement is executed.<br />
Reset status: After one<br />
entry:<br />
(PUSH Data1)<br />
After two<br />
entries:<br />
(PUSH Data2)<br />
Stack.63 0 0 0 Data2<br />
. . . . .<br />
Stack.5 0 0 0 0<br />
Stack.4 0 0 0 0<br />
Stack.3 0 0 0 0<br />
Stack.2 0 0 0 0<br />
Stack.1 0 0 Data 1 0<br />
Stack.0 0 Data 1 Data 2 Data 1<br />
RELATED ITEMS<br />
PUSH or <br />
PUSH or <br />
POP <br />
Int.Mode = 1 See Group number 10 (Int) for information.<br />
EXAMPLE USAGE<br />
Transfer data to a subroutine for conversion.<br />
After one<br />
recall:<br />
(POP )<br />
User's Manual 5.1 Inmotion Technologies AB<br />
Doc. No.9032 0027 01 (B), Rev. 11.07.2001<br />
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