IV

Support Chips

Chapter Heads

22 Interfacing of I/O Devices

23 Intel 8259A—Programmable Interrupt Controller

24 Intel 8257—Programmable DMA Controller

25 Intel 8253—Programmable Interval Timer

26 Intel 8251A—Universal Synchronous Asynchronous Receiver Transmitter (USART)

27 Zilog Z-80 Microprocessor

28 Motorola M6800 Microprocessor

29 8051 Microcontroller

30 Advanced Topics In 8051

INTRODUCTION

This part comprises of Chaps. 22 to 30. In the previous part of the book, 8255 PPI, which is a very popular chip that is used for interfacing I/O devices, was described in detail. Theoretically any I/O device could be interfaced with the microprocessor using the 8255. However, interfacing functionally complex I/O devices, such as keyboard and seven-segment ...

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