Abstract
This chapter discusses different other support devices used in building up a microcomputer system. These include timers, event counters, and various combination devices that may contain RAM, ROM, input–output ports, and perhaps a timer. A typical timer function is achieved by presetting a counter to a specified count and then allowing it to be clocked down to zero. The Intel 8252 Programmable Interval Timer provides three independent fully programmable timer/counters in one package. The Motorola 68901 is a multifunction peripheral device that provides both serial and parallel ports, and a set of four counter timers on a single chip. It is designed to operate directly with 68000 series processors. The MOS Technology 6522 versatile interface adapter is a multifunction peripheral device that provides parallel ports: a simple serial port and two timers in a single device. The Zilog Z8430 Counter Timer Circuit provides a set of four 8-bit fully programmable counter-timer circuits for use with the Z80 type microprocessor.
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