By Jonathan W. Valvano
This publication employs a bottom-up academic strategy with an total academic aim of permitting scholars to find how the pc interacts with its setting via studying uncomplicated desktop structure, meeting language programming, in addition to via an creation to interfacing. constructed round the Freescale 9S12, this booklet describes either the overall techniques and the categorical information all in favour of microcomputer simulation. specifically, targeted case stories are used to demonstrate basic thoughts, and laboratory assignments are supplied.
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Additional resources for Introduction to Embedded Systems: Interfacing to the Freescale 9S12
16. 6. 16. 17 Consider a telephone switching network. For simplicity assume there are only four telephones on this system. Each phone has a keypad with numbers, a call button and a hang up button. Each phone also has a speaker, a microphone and a communication link to the network. Draw a data flow graph of this system showing four rectangles for the keypad, four rectangles for the speakers, and four rectangles for the microphones. Assume there is a dedicated microcontroller for each phone and a central computer to handle the network switching.
To push data on the stack, we first decrement the SP, then store the data at the location specified by SP. 5 represent 8-bit storage elements in RAM. The grey boxes in the figure refer to actual data stored on the stack, and the white boxes refer to locations in memory that do not contain stack data. This figure illustrates how the stack is used to push the numbers 1 2 3 in that order. To pop data from the stack, we first read the data from the location specified by SP, then we increment the SP.
Using the editor, one adds print statements to the code that either verify proper operation or illustrate the programming errors. If we test a system, then remove the instruments, the system may actually stop working, because of the importance of timing in embedded systems. If we leave debugging instruments in the final product, we can use the instruments to test systems on the production line, or test systems returned for repair. On the other hand, sometimes we wish to provide for a mechanism to reliably and efficiently remove all instruments when the debugging is done.