The Intel and are Programmable Interval Timers PITs , which perform timing and counting functions using three bit counters. Timer Channel 2 is assigned to the PC speaker. The is described in the Intel "Component Data Catalog" publication. The , described as a superset of the with higher clock speed ratings, has a "preliminary" data sheet in the Intel "Component Data Catalog". The is implemented in HMOS and has a "Read Back" command not available on the , and permits reading and writing of the same counter to be interleaved. Modern PC compatibles, either when using System on a Chip CPUs or discrete chipsets typically implement full compatibility for backward compatibility and interoperability.
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Parameter Symbol Parameter Description Min. Abstract: timer OX intel u1 74ls intel pin configuration of 74LS microprocessor applications 74ls FU Text: 1. In this application, the three counters of the are fed one into ,. Table 1 details the addressing of the counters,Jhe gate ports and the control registers of the The , named "ntimer.
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8253 Datasheet PDF