Event counting prescaler
US4849924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1985 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Jun 13, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/88
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for counting occurrences of a plurality of events characterized by unique event numbers includes a random access memory for storing event count numbers at addresses corresponding to the event numbers. The memory is addressed by an event number as the associated event occurs, and the event count number stored at such address is read and latched to an input of an adder. The adder increments the latched event count number and the incremented event count number is then written back into the memory at the current event number address. A buffer is provided to store the current event number whenever the adder overflows as a result of a count. Several such event numbers may be stored in the buffer for subsequent retrieval by an external controller thereby permitting the controller to determine when an event has been counted a fixed number of times and to increment its own internally stored count at a slower rate than the rate at which data is applied to the prescaler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.