Author: INTRODUCTION This application note describes changes necessary

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Author: INTRODUCTION This application note describes changes necessary

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MIGRATING FROM XR16C2852 XR16L2752
Author: INTRODUCTION This application note describes changes necessary what consider when migrating from XR16C2852 XR16L2752. HARDWARE DIFFERENCES XR16C2852 XR16L2752 both available 44-pin PLCC TQFP package. XR16C2852 operate only. XR16L2752 operate 2.25 Also, XR16L2752 tolerant inputs while operating whereas XR16C2852 does have tolerant inputs. maximum crystal oscillator frequency XR16C2852 while maximum XR16L2752. crystal oscillator frequency external clock frequencies same. 44-pin PLCC package, XR16C2852 XR16L2752 have identical pinouts they fully pin-topin compatible. FIRMWARE DIFFERENCES internal registers XR16C2852 XR16L2752 identical except registers: FIFO Control Register (FCR) Bit-0 enables FIFO both XR16C2852 XR16L2752, FIFO sizes different. FIFOs bytes deep XR16C2852 bytes deep XR16L2752. Enhanced Mode Select Register (EMSR) Bit-7 used XR16C2852 used XR16L2752 select sampling rate. Bit-7 asserted sampling (default) de-asserted sampling. Bit-6 used XR16C2852 used XR16L2752 select whether Interrupt generated immediately when there data error FIFO delayed until data byte with error being read FIFO. Bit-3 used XR16C2852 used XR16L2752 invert polarity RS485 halfduplex direction control output signal (RTS#) necessary. Device Identification (DVID) register value 0x12 XR16C2852 0x0A XR16L2752.
EXAR Corporation 48720 Kato Road, Fremont 94538 (510) 668-7000 (510) 668-7017 www.exar.com uarttechsupport@exar.com
REPLACING XR16C2852 WITH XR16L2752 directly replace XR16C2852 with XR16L2752 since fully pin-to-pin compatible software compatible. Also, software changes necessary take advantage some enhanced features XR16L2752 such sampling, selecting interrupt mode inverting RS485 polarity. nutshell, XR16C2852 XR16L2752 very similar devices with different FIFO sizes there additional features XR16L2752.
NOTICE EXAR Corporation reserves right make changes products contained this publication order improve design, performance reliability. EXAR Corporation assumes responsibility circuits described herein, conveys license under patent other right, makes representation that circuits free patent infringement. Charts schedules contained here only illustration purposes vary depending upon user's specific application. While information this publication been carefully checked; responsibility, however, assumed inaccuracies. EXAR Corporation does recommend products life support applications where failure malfunction product reasonably expected cause failure life support system significantly affect safety effectiveness. Products authorized such applications unless EXAR Corporation receives, writing, assurances satisfaction that: risk injury damage been minimized; user assumes such risks; potential liability EXAR Corporation adequately protected under circumstances. Copyright 2002 EXAR Corporation August 2002 Send your UART technical inquiry with technical details hotline: uarttechsupport@exar.com Reproduction, part whole, without prior written consent EXAR Corporation prohibited.

Author: INTRODUCTION This application note describes changes necessary

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