 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AN2577 Datasheet(PDF) 4 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
AN2577 Datasheet(HTML) 4 Page - STMicroelectronics |
|
|
4 / 34 page  Overview AN2577 4/34 1 Overview The enhanced time processor unit (eTPU) is an autonomous slave processor offered on several STMicroelectronics microcontrollers designed for real time automotive applications.The processor is tightly coupled to up to 32 channels, each associated with an input and an output signal. The input/output channels each have a pair of Match and Capture units interfaced to one of two timer/counter (TCR) registers. Logic in the channel enabled the hardware to detect or drive pin transitions with a high degree of timing precision. In a typical application, at least one of the TCRs is driven by a real time clock derived from the MCU clock frequency. The second TCR can be driven by an asynchronous external signal, by a real time clock with a different time base, or by special angle clock circuitry on the eTPU. The purpose of the angle clock is to synchronize with the angle of a spinning shaft and provide a counter representation of the instantaneous position of the shaft. If the shaft provides an input signal related to teeth spaced along the circumference, the angle clock extrapolates the number of ticks between the adjacent pairs of teeth, thereby providing a finer resolution of angle than the shaft signal alone can provide. The angle clock was designed for automotive engine control, but finds application in a variety of rotational devices. An angle clock can be implemented in hardware or in software, but either implementation has limitations. A software angle clock cannot divide an input tooth signal into very fine ticks without overwhelming the processor. Even before the tick rate reaches its limit, latency on the processor will begin to distort the ideal count pattern. A hardware angle clock can provide very fine resolution of the ticks, but the hardware becomes complex and large when the logic is required to handle errors and exceptional input signals. The eTPU angle clock has been implemented as a software supported hardware subsystem, effectively eliminating both of these significant limitations. The hardware subsystem has provisions for fast tick counting plus compensation for missing teeth, which are often used to provide an angle key for the shaft. The hardware also provides automatic compensation for acceleration and deceleration, and assists in error recovery. The software handles synchronization and exception handling. |
Similar Part No. - AN2577 |
|
Similar Description - AN2577 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
