Download AISC - Design of Structural Connections 4th 1994 by T.J.HOGAN I.R.THOMAS PDF

By T.J.HOGAN I.R.THOMAS

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The interface manager or group should know enough about programming to help the programmer plan the project. 1 Programming structures After the specifications and preliminary planning are complete, the next step is to develop the flow charts. Strangely some electronic designers will spend days or weeks designing the schematic for a circuit, but when it comes to writing a program the programmer will often skip the flow-charting step. In its simplest form, a program is a collection of subroutines.

The technician or engineer shows up on site and finds that the equipment has either failed or locked up. The troubleshooter turns the power off and then back on and the equipment starts to work again. The logbook shows 'unknown failure'. The cause of the lockup is not exactly known but the troubleshooter has a fair idea. There may have been a high voltage spike or power failure that has caused the microcontroller to go off into never-never land. This is a place in the microcontroller's memory from where it cannot return.

Often data or an address is placed on the stack to free up the A or B accumulators or the X or Y registers in a subroutine. The subroutine usually pushes a value on the stack and then later on pulls the value off the stack. It is possible to use values on the stack by using an offset instruction. This pulls the value off the stack in the same way one might pull a plate from the middle of a pile of plates. Some programming books suggest that the programmer push A, B, X and Y on the stack at the beginning of every subroutine.

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