Embedded Controller Hardware Design by Ken Arnold

By Ken Arnold

Ken Arnold is an skilled embedded platforms dressmaker and president of HiTech gear, Inc., an embedded platforms layout enterprise situated in San Diego, California. He additionally teaches classes in embedded and software program layout on the collage of California-San Diego. supplies the reader an built-in hardware/software method of embedded controller layout Stresses a "worst case" layout procedure for the tough environments during which embedded platforms are frequently used comprises layout examples to make vital strategies come alive

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Timer/Counter The 8031 has two timer/counters and the 8032 has three. Serial I/O The serial I/O port that is built into the 8031 can be used to transmit and receive asynchronous (un-clocked) serial data, as is used on a PC’s serial port. It can also be used for synchronous (clocked) serial data transfers. 39 CHAPTER TWO Microcontroller Concepts Reset Circuitry The reset input pin should be connected to an external resistor and capacitor, so that the processor will be properly initialized upon initial application of power.

When using external program or data memory, only Port 1 (P1) is available for general purpose I/O. External memory uses Port 0 (P0) for the multiplexed data bus and address bits 0-7, and Port 2 (P2) for address bits 8-15, while Port 3 (P3) contains special control signals, such as the read and write strobe pins. In addition to the basic parallel I/O bits on the four ports, some of the port bits have alternate functions. The alternate functions include the serial I/O port signals, timer and interrupt inputs.

Four register banks (each bank has eight registers), 128 individually addressable memory bits, and the stack all reside in the internal data RAM. The stack depth is limited only by the available internal data RAM. The 8-bit stack pointer determines the stack’s location. R Figure 2-10: The internal data memory. The internal data RAM provides a convenient 128 byte scratch pad memory which includes the register banks, SFRs, and general purpose data storage. RAM locations 00-7F hex • Register banks: There are four register banks within the internal data RAM.

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