By Jonathan W. Valvano
Retail quality
This ebook employs a bottom-up academic method with an total academic target of permitting scholars to find how the pc interacts with its atmosphere via studying simple laptop structure, meeting language programming, in addition to via an creation to interfacing. built round the Freescale 9S12, this publication describes either the final techniques and the explicit information serious about microcomputer simulation. specifically, distinctive case experiences are used to demonstrate primary options, and laboratory assignments are supplied.
Read or Download Introduction to Embedded Systems: Interfacing to the Freescale 9S12 PDF
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Additional resources for Introduction to Embedded Systems: Interfacing to the Freescale 9S12
Example text
Some instructions operate completely within the processor and require no memory data fetches. These instructions have no operand and are classified as inherent. If the data is found in the instruction itself, the instruction uses immediate addressing mode. The data will be a constant, meaning each time that instruction is executed, it will use same data value. If the instruction uses the absolute address to specify the memory data location, the instruction uses either direct or extended addressing mode.
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. Draw a possible data flow graph for system, that allows each phone to call the other three. 18 Consider an MP3 player, which has a memory storage device, an MP3 decoder (converts compressed data into raw form), buttons, an LCD display, a USB link to a PC, dual DACs for stereo output, and stereo headphones.
The sequence, conditional, and while-loop are the three building blocks of structured programming. 16 We can decompose a task using the building blocks of structured programming. Task True Subtask 1 Subtask 2 Condition False Condition Subtask 1 Subtask 2 True Subtask Subtask False Sequential Conditional Iterative Interrupt 18 1 Ⅲ Introduction to Embedded Microcomputer Systems interrupt synchronization. An interrupt is a hardware-triggered software function, which will be discussed in more detail in Chapters 8, 10, 11, and 12.
