The Enhanced Controller Area Network (ECAN) mod- ule, offered by many of the PIC18F family of PICmicro ® microcontrollers, is the latest enhancement to the exist- ing legacy CAN module. Devices such as the PIC18C658/858 and PIC18F248/258/448/458 use the legacy CAN module. ECAN offers many enhancements over the legacy CAN module in terms of more transmit/receive buffers, acceptance filters, and hardware FIFO operation. At the same time, the ECAN module is fully backward compatible with the legacy CAN module. ECAN provides three modes of operation – Mode 0, Mode 1 and Mode 2. Mode 0 is fully backward compat- ible with the legacy CAN module. Applications devel- oped for the legacy CAN module would continue to work without any change using ECAN. Mode 1 is the Enhanced Legacy mode with increased buffers and fil- ters. Mode 2 has the same resources as Mode 1, but with a hardware managed receive FIFO. Given its fea- tures and flexibility, ECAN would prove useful to many CAN-based applications. This application note implements ‘C’ routines to access all features of the ECAN module. This document does not describe ECAN and the related PIC18F family in detail. Readers are encouraged to read the PIC18F6585/6680/8585/8680 device data sheet (DS30491) for more information. AN878 PIC18C ECAN ‘C’ Routines Authors: Caio Gübel and Nilesh Rajbharti OVERVIEW OF ECAN MODULE Microchip Technology, Inc. Following are the main features of the ECAN module: Fully backward compatible with the legacy CAN INTRODUCTION module Three functional modes: The Enhanced Controller Area Network (ECAN) mod- - Mode 0 ……