Noise resistant interrupt circuits.

摘要

In an interrupt circuit for connection to a shared interrupt request line, an internally generated interrupt impresses an interrupt request line and also locks out any further interrupt requests until the interrupt request is analysed to be of minimum duration, in which case the lock out is latched. An interrupt request on the shared interrupt request line is also analysed for minimum duration before it causes a lock out to be latched. A latched lock out is removed by a signal generated by the interrupt handler.