Method and apparatus for digital I/O expander chip with multi-function timer cells

摘要

A method and apparatus for digital I/O expander chip with multi-function timer cells have been disclosed. A series of match reload registers load a series of match registers which are driven by a master counter. The status of the match registers can be retrieved through ports. The master counter is reloaded on rollover by a count limit register. The master counter has increment/decrement control and the rollover can be used in an interrupt control block to generate an interrupt request.

主权项

1. A method comprising:
loading a count limit register with a count limit; generating a rollover signal when a master counter reaches a pre-specified count; reloading said master counter with said count limit when said rollover signal occurs; loading a plurality of match reload registers with values; reloading a plurality of match registers with said values when said rollover signal occurs; and generating one or more outputs when a master counter count and a match register value are equal.