By Durham M.O.
ISBN-10: 0971932468
ISBN-13: 9780971932463
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Extra resources for Systems Design and the 8051
Example text
Because of other features, it is probably the least used port in normal programming. However, when used as a memory connection, the port has internal pull-up resistors. Port 2 __________________________ Port 2 is another 8-pin I/O connection (pins 21-28). It is less frequently used in normal programming. It is quasi bi-directional, has internal pull-ups, and can sink/source four TTL devices. When 1s are written to the pins, they are pulled high by the internal pull-ups and the pin can be used as an input.
Program and data memory are external chips. The most popular variation has program memory and data memory on board the processor chip. In this family of computers, program memory is separate from data. This is called Harvard architecture and it is the design used by Intel related machines. Mixed memory is Von Neumann’s Princeton architecture. It is the design used by Motorola related machines. Reduced instruction set computers (RISC) have very few instructions but these can access any register in the computer.
A typical 32K address X 8-bit byte package is illustrated as a 256K bit device in the following diagram. Chapter 3 Memory Devices 33 Connections _____________________ Like most other DIP packages, power is supplied to the upper right (pin 28), and ground is supplied to the lower left (pin14). * V A14 1 28 VCC A12 2 27 /WE A7 3 26 A13 A6 4 25 A8 A5 5 24 A9 A4 6 23 A11 A3 7 22 //OE A2 8 21 A10 A1 9 20 //CE A0 10 19 DQ7 DQ0 11 18 DQ6 DQ1 12 17 DQ5 DQ2 13 16 DQ4 Ground 14 15 DQ3 Memory 256K In addition, the chip must be selected or enabled.
Systems Design and the 8051 by Durham M.O.
by Robert
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