datasheet, circuit, data sheet: INTEL – PROGRAMMABLE INTERVAL TIMER,alldatasheet, datasheet, Datasheet search site for Electronic. from Intel Corporation. Find the PDF Datasheet, Specifications and Distributor Information. The Intel 82C54 is a high-performance CHMOS version of the industry standard programmable The 82C54 is pin compatible with the HMOS and is a superset of the NOTICE This is a production data sheet The specifi-.
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There are 6 modes in total; for modes 2 and 3, the D3 bit is ignored, so the missing modes 6 and 7 are aliases for modes 2 and 3.
The fastest possible interrupt frequency is a little over a half of a megahertz. This prevents any serious alternative uses of the timer’s second counter on many x86 systems. The timer that is used by 82533 system on x86 Darasheet is Channel 0, and its clock ticks at a theoretical value of OUT will go low on the Clock pulse following a trigger to begin the one-shot pulse, and will remain low until the Counter reaches zero.
OUT will then go high again, and the whole process repeats itself. Retrieved 21 August The counting process will start after the PIT has received these messages, and, in some cases, if it detects the rising edge from the GATE input signal. OUT will then remain high until the counter reaches 1, and will go low for one clock pulse. If Gate goes low, counting is suspended, and resumes when it goes high again.
Datasheet(PDF) – Intel Corporation
This page was last edited on 27 Satasheetat Bits 5 through 0 are the same as the last bits written to the control register. The one-shot pulse can be repeated without rewriting the same count into the counter. Besides the counters, a typical Intel microchip also contains the following components:. From Wikipedia, the free encyclopedia.
GATE input is used as trigger input. As stated above, Channel 0 is implemented as a counter. Reprogramming typically happens infel video mode changes, when the video BIOS may be executed, and datssheet system management mode and power saving state changes, when the system BIOS may be executed. When the counter reaches 0, the output will go low for one clock cycle — after that it will become high again, to repeat the cycle on the next rising edge of GATE.
Reprogramming typically happens during video mode changes, when the video BIOS may be executed, and during system management mode and power saving state changes, when the system BIOS may be executed. The Intel and are Programmable Interval Timers PITswhich perform timing and counting functions using three bit counters.
The time between the high pulses depends on the preset datashedt in the counter’s register, and is calculated using the following formula:.
Datasheet pdf – Programmable interval Timer – Advanced Micro Devices
This mode is similar to mode 2. Intel has the datassheet pinout. The time between the high pulses depends on the preset count in the counter’s register, and is calculated using the following formula:. The Intel and are Programmable Interval Timers PITswhich perform timing and counting functions using three bit counters. Intel Intel C For details on each mode, see the reference links.
This is a holdover of the very first Datasjeet PCs — they derived all necessary frequencies from a single quartz crystaland to make TV output possible, this oscillator had to run at a multiple of the NTSC color subcarrier frequency. Operation mode of the PIT is changed by setting the above hardware signals. The one-shot pulse can be repeated without dataseet the same count into the counter. The first byte of the new count when loaded in the count register, stops the previous count.
However, the counting process is triggered by the GATE input. The counter then resets to its initial value and begins to count down again. Views Read Edit View history. In this mode can be used as a Monostable multivibrator. The three counters are bit down counters independent datassheet each other, and can be easily read by the CPU. Timer Channel 2 is assigned to the PC speaker.
The counter will then generate a low pulse for 1 clock cycle a strobe — after that the output will become high again. The D3, D2, and D1 bits of the control word set the operating mode of the timer. D0 D7 is the MSB. Use dmy dates from July OUT will be initially high.
Mode 0 is used for the generation of accurate time delay under software control. If Gate goes low, counting gets terminated and current count is latched till Gate pulse goes high again. The Intel 82c54 variant handles up to 10 MHz clock signals. However, in free-running counter applications such as in xatasheet x86 PC, it is necessary to first write a latch command for the desired channel to the control intsl, so that both bytes read will belong to one and the same value.
Thedescribed as a superset of the with higher clock speed ratings, has a “preliminary” data datssheet in the Intel “Component Data Catalog”.
Block diagram of Intel The control word register contains 8 bits, labeled D OUT will be initially high. Modern PC compatibles, either when using System on a Chip CPUs or discrete chipsets typically implement full compatibility for backward compatibility and interoperability.
In this mode can be used as Monostable Multivibrator.