Transcription of 8254 PROGRAMMABLE INTERVAL TIMER - Stanford University
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8254 PROGRAMMABLE INTERVAL TIMER - Stanford University
September 1993 Order Number: 231164-0058254 PROGRAMMABLE INTERVAL TIMERYC ompatible with All Intel and MostOther MicroprocessorsYHandles Inputs from DC to 10 MHz 8 MHz 8254 10 MHz 8254-2 YStatus Read-Back CommandYSix PROGRAMMABLE Counter ModesYThree Independent 16-Bit CountersYBinary or BCD CountingYSinglea5V SupplyYAvailable in EXPRESS Standard Temperature RangeThe Intel 8254 is a counter/ TIMER device designed to solve the common timing control problems in microcom-puter system design. It provides three independent 16-bit counters, each capable of handling clock inputs upto 10 MHz. All modes are software PROGRAMMABLE . The 8254 is a superset of the 8254 uses HMOS technology and comes in a 24-pin plastic or CERDIP 1 Figure 1. 8254 Block Diagram231164 2 Figure 2. Pin Configuration8254 Table 1. Pin DescriptionSymbolPinTypeName and D01 8I/ODATA:Bi-directional three state data bus lines, connected to systemdata 09 ICLOCK 0:Clock input of Counter 010 OOUTPUT 0:Output of Counter 011 IGATE 0: gate input of Counter :Power supply :a5V power supply CONTROL:This input is low during CPU write CONTROL:This input is low during CPU read SELECT:A low on this input enables the 8254 to respond toRDand
GATE 2 16 I GATE 2: Gate input of Counter 2. CLK 1 15 I CLOCK 1: Clock input of Counter 1. GATE 1 14 I GATE 1: Gate input of Counter 1. OUT 1 13 O OUT 1: Output of Counter 1. FUNCTIONAL DESCRIPTION General The 8254 is a programmable interval timer/counter designed for use with Intel microcomputer systems.
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