28.2 Overview

The Configurable Custom Logic (CCL) is a programmable logic peripheral which can be connected to the device pins, to events, or to other internal peripherals. The CCL can serve as "glue logic" between the device peripherals and external devices. The CCL can eliminate the need for external logic components, and can also help the designer to overcome real-time constraints by combining core independent peripherals to handle the most time-critical parts of the application independent of the CPU.

The CCL peripheral has one pair of Look-Up Tables (LUT). Each LUT consists of three inputs, a truth table, and a filter/edge detector. Each LUT can generate an output as a user programmable logic expression with three inputs. Inputs can be individually masked.

The output can be generated from the inputs combinatorially and can be filtered to remove spikes. An optional sequential module can be enabled. The inputs to the sequential module are individually controlled by two independent, adjacent LUT (LUT0/LUT1) outputs, enabling complex waveform generation.