MIGRATING FROM ST16C2550 XR16L2750 Author: INTRODUCTION This appl

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MIGRATING FROM ST16C2550 XR16L2750 Author: INTRODUCTION This appl

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DATA COMMUNICATIONS APPLICATION NOTE DAN164
MIGRATING FROM ST16C2550 XR16L2750
Author: INTRODUCTION This application note describes changes necessary what consider when migrating from ST16C2550 XR16L2750. HARDWARE DIFFERENCES Table below summarizes differences between ST16C2550 XR16L2750. TABLE SUMMARY DIFFERENCES BETWEEN ST16C2550 XR16L2750
HARDWARE DIFFERENCES Available Packages Operating Voltage Range Tolerant Inputs Maximum data rate Maximum data rate 3.3V ST16C2550 48-pin TQFP, 44-pin PLCC 40-pin PDIP 2.97V 5.5V Mbps 1.875 Mbps XR16L2750 48-pin TQFP 44-pin PLCC 2.25V 5.5V 6.25 Mbps Mbps
ST16C2550 XR16L2750 both available 44-pin PLCC 48-pin TQFP packages. ST16C2550 also available 40-pin PDIP package XR16L2750 not. ST16C2550 operate from 2.97 5.5V only. XR16L2750 operate from 2.25 maximum data rate ST16C2550 Mbps using external clock 1.875 Mbps 3.3V using 30MHz external clock. ST16C2550 uses data sampling rate 16X. maximum data rate XR16L2750 6.25 Mbps using external clock Mbps 3.3V using 33MHz external clock. These maximum data rates achieved XR16L2750 enabling sampling rate EMSR bit-7. 44-pin PLCC 48-pin TQFP packages, ST16C2550 XR16L2750 have identical pinouts they fully pin-to-pin compatible. XR16L2750 available 40-pin PDIP package. FIRMWARE DIFFERENCES internal register XR16L2750 based internal register ST16C2550, except that some unused bits ST16C2550 register used XR16L2750. Also, XR16L2750 Enhanced Register found ST16C2550. Table following page lists firmware differences between ST16C2550 XR16L2750.
EXAR Corporation 48720 Kato Road, Fremont 94538 (510) 668-7000 (510) 668-7017 www.exar.com uarttechsupport@exar.com
DATA COMMUNICATIONS APPLICATION NOTE DAN164
TABLE ST16C2550 XR16L2750 REGISTER DIFFERENCES
A2:A0
ST16C2550 Interrupt Enable Register (IER) Bit-7 Used
XR16L2750 Interrupt Enable Register (IER) Bit-7 Auto CTS# Interrupt Enable
Bit-7 (Standard Register Set)
Bit-6 Used Bit-5 Used Bit-4 Used
FIFO Control Register (FCR) Bit-5 Used
Bit-6 Auto RTS# Interrupt Enable Bit-5 Xoff Interrupt Enable Bit-4 Sleep Mode Enable
FIFO Control Register (FCR) Bit-5 FIFO Trigger Level Select Bit-1
Bit-4 Used
Interrupt Status Register (ISR) Bit-5 Used
Bit-4 FIFO Trigger Level Select Bit-0
Interrupt Status Register (ISR) Bit-5 Auto RTS/CTS Interrupt
Bit-4 Used
Modem Control Register (MCR) Bit-7 Used
Bit-4 Xoff Special Character Interrupt
Modem Control Register (MCR) Bit-7 Prescaler Select
Bit-6 Used Bit-5 Used
Bit-7 FCTR Bit-6
Bit-6 Mode Enable Bit-5 XonAny
Enhanced Mode Select Register (EMSR) Sampling, Interrupt Immediate, Auto Hysteresis Select (MSB), RS485 Output Inversion, FLVL select FIFO FIFO Level Register (FLVL) Current Level FIFO Device Revision (DREV) Device (DVID) 0x0A FIFO Data Count Register (FC) Trigger Level Register (TRG) Programmable Trigger Levels 1-64 FIFO Feature Control Register (FCTR) RX/TX Programmable Trigger Level Select, Scratchpad Swap, Trigger Table Select, Auto RS485 Enable, Infrared Input Inversion, Auto Hysteresis Select (LSB) Enhanced Feature Register (EFR) Auto RTS/CTS Enable, Enable Enhanced (shaded) bits Standard Register Set, Software Flow Control Select XON1 XON2 XOFF1 XOFF2
Bit-7 0x00, 0x00
0xBF (Enhanced Register Set)
REPLACING ST16C2550 WITH XR16L2750 directly replace ST16C2550 with XR16L2750 44-pin PLCC 48-pin TQFP packages. those packages, they pin-to-pin compatible. using ST16C2550 40-pin PDIP package, then hardware changes will required since XR16L2750 available that package. Since internal registers XR16L2750 same ST16C2550, XR16L2750 will work with same driver that used with ST16C2550 without changes. However, take advantage enhanced features XR16L2750 such larger FIFO, Programmable Trigger Levels, FIFO Level Counters, Auto Hardware Flow Control, Auto Software Flow Control RS-485 Half-Duplex Control, existing software needs modified. nutshell, ST16C2550 XR16L2750 very similar devices with different FIFO sizes XR16L2750 some addtional features found ST16C2550.
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 2005 EXAR Corporation January 2005 Send your UART technical inquiry with technical details hotline: uarttechsupport@exar.com Reproduction, part whole, without prior written consent EXAR Corporation prohibited.

MIGRATING FROM ST16C2550 XR16L2750 Author: INTRODUCTION This appl

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