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The current state of the inputs of a channel can be read through an 8 bit edge clocked inverting buffer (U41, U42, U44 and U46). When the buffer is addressed, the clock input will go high, sampling the current state of the outputs of the debounce circuits of the channel. Also the outputs of the buffer will be enabled. As long as the read operation continues, changes in the debounce outputs will have no effect on the data read.
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