28.4 Operation

The CLCx Control register (CLCxCON) is used to enable the module and interrupts, control the output enable bit, select output polarity and select the logic function. The CLCx Control register also allows the user to control the logic polarity of not only the cell output but also some intermediate variables.

The CLCx Input MUX Select register (CLCxSEL) allows the user to select one out of eight input signals for each of the four data selection multiplexers, pictured inside the dotted line in Figure 28-2. The output of each of the four data selection multiplexers is connected to the inputs of the logic function selected by the MODE[2:0] bits (CLCxCON[2:0]), see Figure 28-3.

The CLCx Source Enable register (CLCxGLS) allows the user to create any four variable boolean expressions from the four input data sources configured by CLCxSEL. Both the true and complementary values for each of the four signals, chosen by the CLCx Input MUX Select register (CLCxSEL), are available to the sum-of-products circuit pictured in the data gate in Figure 28-2.