Configurable Logic Cell

Custom Logic on PIC® and AVR® Microcontrollers

What Is a CCL or CLC?

Through logic gates, systems can make decisions based on criteria without Central Processing Unit (CPU) intervention. Traditionally, these logic gates are manually implemented as external components, however AVR^® and PIC^® microcontrollers (MCUs) offer this as a built-in functionality to save cost and application space.

The on-chip Configurable Logic Cell (CLC) peripheral on PIC MCUs and Configurable Custom Logic (CCL) peripheral on AVR MCUs eliminates the need for external components and complicated design work. With these on-chip peripherals, you can apply customized logic without physically expanding your application’s size.

If your design changes during the development process, your logic can be easily reconfigured with MPLAB Code Configurator or Atmel START.

Explore Atmel START Examples

Explore MPLAB Xpress Examples

How Can Your Design Benefit From the CCL and CLC?

With custom logic peripherals, you can apply combinatorial and sequential logic to both internal and external signals. This bypasses the CPU through hardware-based logic, and also automates task handling within your system.

How Are They Used?

Configurable Logic Cell on PIC MCUs

The CLC has a variety of basic gates as well as sequential logic options that can be customized to create the logic specific to your application. Through these logic gates, the CLC gives you the ability to combine signals to make a new custom signal without running code to execute it. This peripheral can also be used for routing pins on the MCU. For instance, you can easily configure the CLC peripheral to route the incoming RX signal of a connected Bluetooth^® module to the virtual TX pin of your development board.

Configurable Custom Logic on AVR MCUs

The CCL on AVR MCUs can function as a simple logic gate, flip flop, delay element, filter or latch. You can also build your own custom gates through the lookup table. The lookup table behaves like a programmable truth table and features the ability to set the output of your gate based on entered values or an entered expression such as (!a * b + c). The results of the CCL can be used to trigger other peripherals as well without any CPU intervention.

Application Notes

Title	Download
AN2912 - Using CLCs in Real-Time Applications	Download
AN2522 - Core Independent Brushless DC Fan Control Using CCL AVR Microcontrollers	Download
TB3218 - Getting started with CCL	Download
AN1606 - Using the Configurable Logic Cell (CLC) to Interface a PIC16F1509 and WS2811 LED Driver	Download
AN2387 - Core Independent Nightlight Using Configurable Custom Logic on ATtiny1617	Download
TB3133 - Configurable Logic Cell on PIC Microcontrollers	Download
AN2133 - Extending PIC MCU Capabilities Using CLC	Download

Tutorials and Examples

8-bit Microcontrollers with Configurable Logic Cell (CLC)

View All Parametrics

Product	Pin Count	Program Memory Size (KWords)	Configurable Logic Cell Modules (CLC /CCL)	Configurable Logic Cell Modules (CLC /CCL) Type
ATMEGA1608	32	8	1	CCL
ATMEGA1609	48	8	1	CCL
ATMEGA3208	32	16	1	CCL
ATMEGA3209	48	16	1	CCL
ATMEGA4808	32	24	1	CCL
ATMEGA4809	48	24	1	CCL
ATMEGA808	32	4	1	CCL
ATMEGA809	48	4	1	CCL
ATTINY1604	14	8	1	CCL
ATTINY1606	20	8	1	CCL
ATTINY1607	24	8	1	CCL
ATTINY1614	14	8	1	CCL
ATTINY1616	20	8	1	CCL
ATTINY1617	24	8	1	CCL
ATTINY1624	14	8	1	CCL
ATTINY1626	20	8	1	CCL
ATTINY1627	24	8	1	CCL
ATTINY202	8	1	1	CCL
ATTINY204	14	1	1	CCL
ATTINY212	8	1	1	CCL
ATTINY214	14	1	1	CCL
ATTINY3216	20	16	1	CCL
ATTINY3217	24	16	1	CCL
ATTINY402	8	2	1	CCL
ATTINY404	14	2	1	CCL
ATTINY406	20	2	1	CCL
ATTINY412	8	2	1	CCL
ATTINY414	14	2	1	CCL
ATTINY416	20	2	1	CCL
ATTINY417	24	2	1
ATTINY804	14	4	1	CCL
ATTINY806	20	4	1	CCL
ATTINY807	24	4	1	CCL
ATTINY814	14	4	1	CCL
ATTINY816	20	4	1	CCL
ATTINY817	24	4	1	CCL
AVR128DA28	28	32	1	CCL
AVR128DA32	32	64	1	CCL
AVR128DA48	48	64	1	CCL
AVR128DA64	64	64	1	CCL
AVR128DB28	28	64	1	CCL
AVR128DB32	32	64	1	CCL
AVR128DB48	48	64	1	CCL
AVR128DB64	64	64	1	CCL
AVR32DA28	28	16	1	CCL
AVR32DA32	32	16	1	CCL
AVR32DA48	48	16	1	CCL
AVR64DA28	28	32	1	CCL
AVR64DA32	32	32	1	CCL
AVR64DA48	48	32	1	CCL
AVR64DA64	64	32	1	CCL
PIC16F15313	8	2	4	CLC
PIC16F15323	14	2	4	CLC
PIC16F15324	14	4	4	CLC
PIC16F15325	14	8	4	CLC
PIC16F15344	20	4	4	CLC
PIC16F15345	20	8	4	CLC
PIC16F15354	28	4	4	CLC
PIC16F15355	28	8	4	CLC
PIC16F15356	28	16	4	CLC
PIC16F15375	40	8	4	CLC
PIC16F15376	40	16	4	CLC
PIC16F15385	48	8	4	CLC
PIC16F15386	48	16	4	CLC
PIC16F18313	8	2	2
PIC16F18323	14	2	2
PIC16F18324	14	4	4
PIC16F18325	14	8	4
PIC16F18326	14	16	4
PIC16F18344	20	4	4
PIC16F18345	20	8	4
PIC16F18346	20	16	4	CLC
PIC16F18424	14	4	4
PIC16F18425	14	8	4
PIC16F18426	14	16	4	CLC
PIC16F18444	20	4	4
PIC16F18445	20	8	4	CLC
PIC16F18446	20	16	4	CLC
PIC16F18455	28	8	4	CLC
PIC16F18456	28	16	4
PIC16F18854	28	4	4
PIC16F18855	28	8	4
PIC16F18856	28	16	4
PIC16F18857	28	32	4
PIC16F18875	40	8	4
PIC16F18876	40	16	4
PIC16F18877	40	32	4
PIC16F19155	28	8	4
PIC16F19156	28	16	4
PIC16F19175	40	8	4
PIC16F19176	40	16	4
PIC16F19185	48	8	4
PIC16F19186	48	16	4
PIC16F19195	64	8	4
PIC16F19196	64	16	4
PIC16F19197	64	32	4
PIC18F04Q40	14	8	4	CLC
PIC18F04Q41	14	8	4	CLC
PIC18F05Q40	14	16	4	CLC
PIC18F05Q41	14	16	4	CLC
PIC18F06Q40	14	32	4	CLC
PIC18F06Q41	14	32	4	CLC
PIC18F14Q40	20	8	4	CLC
PIC18F14Q41	20	8	4	CLC
PIC18F15Q40	20	64	4	CLC
PIC18F15Q41	20	16	4	CLC
PIC18F16Q40	20	32	4	CLC
PIC18F16Q41	20	32	4	CLC
PIC18F24K42	28	8	4	CLC
PIC18F25K42	28	16	4	CLC
PIC18F25K83	28	16	4	CLC
PIC18F25Q43	28	16	8	CLC
PIC18F26K42	28	32	4	CLC
PIC18F26K83	28	32	4	CLC
PIC18F26Q10	28	32	8	CLC
PIC18F26Q43	28	32	8	CLC
PIC18F26Q83	28	32	8	CLC
PIC18F26Q84	28	32	8	CLC
PIC18F27K42	28	64	4	CLC
PIC18F27Q10	28	64	8	CLC
PIC18F27Q43	28	64	8	CLC
PIC18F27Q83	28	64	8	CLC
PIC18F27Q84	28	64	8	CLC
PIC18F45K42	40	16	4	CLC
PIC18F45Q10	40	16	8	CLC
PIC18F45Q43	40	16	8	CLC
PIC18F46K42	40	32	4	CLC
PIC18F46Q10	40	32	8	CLC
PIC18F46Q43	40	32	8	CLC
PIC18F46Q83	40	32	8	CLC
PIC18F46Q84	40	32	8	CLC
PIC18F47K42	40	64	4	CLC
PIC18F47Q10	40	64	8	CLC
PIC18F47Q43	40	64	8	CLC
PIC18F47Q83	40	64	8	CLC
PIC18F47Q84	40	64	8	CLC
PIC18F55K42	48	16	4	CLC
PIC18F55Q43	48	16	8	CLC
PIC18F56Q43	48	32	8	CLC
PIC18F56Q83	48	32	8	CLC
PIC18F56Q84	48	32	8	CLC
PIC18F57Q43	48	64	8	CLC
PIC18F57Q83	48	64	8	CLC
PIC18F57Q84	48	64	8	CLC

How To Use Neopixels With PIC® Microprocessors

This video will show how to build a driver for WS2812 Neopixel LEDs. Typically drivers for these LEDs are implemented in software. However this tutorial will show a hardware based implementation of this driver. You will learn to create the custom serial protocol used by these Neopixels through mixing the peripheral signals available on your PIC device. This will be done with the Configurable Logic Cell peripheral available on many PIC devices.

MM - MPLAB® Xpress IDE Edition - Episode 13 - Using the CLC to Create a PWM Signal

In this How-To tutorial we discuss creating a new peripheral using the custom logic provided by the Configurable Logic Cell on Microchip microcontrollers. Combine a standard SPI module with a timer through the CLC in an SR-Latch configuration in order to create a new PWM signal. This is particularly useful if you have already used all the available PWM’s available, and still need one more. While this tutorial shows how to make a PWM signal, the CLC allows users to create many new peripherals by combing different peripheral input signals into a new final result.

MM - MPLAB® Xpress IDE Edition Episode 10 - Enabling Combinational Wake-Up Sources using the CLC

The Configurable Logic Cell (CLC) peripheral is used to wake the microcontroller from Low Power SLEEP only when a combination of pin conditions have occurred.

*Note that this application uses the EUSART peripheral to connect through a USB-to-UART converter to an available USB port. More information on this connection is discussed in Microchip Minutes MPLAB® Xpress IDE Edition - Episode 5: https://www.youtube.com/watch?v=Cp1NL...

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