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Extra info for Advanced Pic Microcontroller - Projects In C From Usb To Rtos With The Pic18F Series

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The PIC18F452 has only 32Kbytes of program memory, which requires only 15 bits. The remaining 6 address bits are redundant and not used. A table pointer provides access to tables and to the data stored in program memory. The program memory contains a 31-level stack which is normally used to store the interrupt and subroutine return addresses. The data memory can be seen at the top center of the diagram. The data memory bus is 12 bits wide, capable of accessing 4Kbytes of data memory locations. As we shall see later, the data memory consists of special function registers (SFR) and general purpose registers, all organized in banks.

What is an analog-to-digital converter? Give an example of how this converter is used. 8. Explain why a watchdog timer could be useful in a real-time system. 9. What is serial input-output? Where would you use serial communication? 10. Why is the current sink/source capability important in the specification of an output port pin? com Microcomputer Systems 41 11. What is an interrupt? Explain what happens when an interrupt is recognized by a microcontroller? 12. Why is brown-out detection important in real-time systems?

An example follows. 7510 in floating point and then calculate the sum of these numbers. 7510 = 0 01110110 (1)100 0000 0000 0000 0000 0000 Since the exponents of both numbers are the same, there is no need to shift the smaller number. If we add the mantissa of the numbers without considering the decimal points, we get: (1)000 0000 0000 0000 0000 0000 (1)100 0000 0000 0000 0000 0000 รพ (10)100 0000 0000 0000 0000 0000 To normalize the number, shift it right by one digit and then increment its exponent.

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