AT89C5131A Starter Kit... Hardware User Guide

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1 ATCA Starter Kit... Hardware User Guide

2 Table of Contents Section Introduction Features...- Section Hardware Description Block Diagram...-. Power Supply...-. C Standard Settings...-. Feature Description...-. External Connectors...- Section Device Programming In-System Programming...-. Using a Programmer...- Section Appendix Electrical Schematics...-. Component Placement...-. Mechanical Outlines...-. Bill of Materials...- ATCA Starter Kit Hardware User User Guide A USB /0

3 Section Introduction This document describes the ATCA Starter Kit Evaluation Board dedicated to the ATCA USB microcontroller. This board is designed to allow an easy evaluation of the product using demonstration software (refer to Software Guide).. Features The ATCA evaluation board provides the following features: Possibility to choose between two packages for the ATCA PLCC -pin package VQFP -pin package On-board power supply circuitry from an external power connector from an external battery from the USB line via the USB on-board connector On-board reset, INT0, LEDs, EA, ISP and programming interface Power,, RS Rx and Tx LEDs External system clock connector PCA clock connector USB, TWI, SPI and RS hardware connectors Two Connectors available for extended board ATCA Starter Kit Hardware User Guide - Rev. A USB /0

4 Introduction Figure -. ATCA Evaluation Board - ATCA Starter Kit Hardware User Guide A USB /0

5 Hardware Description Section Hardware Description. Block Diagram Figure -. ATCA Evaluation Board Components Device Power Supply USB TWI SPI Device Reset ISP EA INT0 ATCA RS Host, Device... C Generic Board Interface LED Programming Interface C Generic Board Human Specific Device ATCA Starter Kit Hardware User Guide - A USB /0

6 Hardware Description. Power Supply The on-board power supply circuitry allows various power supply configurations. The power source can be: V BUS from USB (V) V BUS from USB (V) through the current limiter External power supply (from to V) or V battery The voltage output can be the direct power source, regulated at V or.v. The power supply selection is performed using the JP, JP, JP and JP jumpers. The power supply can be turned on/off using the power switch (SW). Once the power is established, the power LED (D) is lit. Figure -. Different Power Configurations Power Source Regulation and Current Limiter External PWR.S. PWR.S. PWR.S. Direct Input LIM REG V LIM REG V LIM REG V ICC.V PWR ICC.V PWR ICC.V PWR PWR.S. PWR.S. PWR.S. V Regulate LIM REG V LIM REG V LIM REG V ICC.V PWR ICC.V PWR ICC.V PWR PWR.S. PWR.S. PWR.S..V Regulate LIM REG V LIM REG V LIM REG V ICC.V PWR ICC.V PWR ICC.V PWR - ATCA Starter Kit Hardware User Guide A USB /0

7 Hardware Description. C Standard Settings.. Reset The external Reset push-button (SW) is provided to easily generate a warm reset. This button is used for ISP process. The Reset applied is active low... Clock A crystal can be easily installed on the Y socket. The clock can also be provided using the J connector instead of the crystal. Note: Remove the clock generators before the using the programmer... EA Place a jumper on the EA connector (J0) to force the EA pin to ground and execute external code. Otherwise internal code will be executed. Figure -. EA Circuitry.. INT0 In order to use the on-board INT0 circuitry, connect the J Jumper to the ATCA. When you press the INT0 button (SW), the P. pin will go low which induces an interrupt event. Note: Remove the J jumper before using the programmer. Otherwise the programmer will not function. Figure -. INT0 Circuitry ATCA Starter Kit Hardware User Guide - A USB /0

8 Hardware Description. Feature Description.. RS The ATCA evaluation board includes all the required hardware to manage the RS communication. Figure -. RS On-board Circuitry.. USB Peripheral The ATCA evaluation board provides all the required hardware to develop a USB firmware for the ATCA, this includes: a USB connector test points on D+ and D- test point on V BUS a USB UNLOAD button which allows to disconnect the pull-up on D+ and then to simulate an Attach/Detach of the USB cable The USB peripheral can also be used to perform an In-System Programming. - ATCA Starter Kit Hardware User Guide A USB /0

9 Hardware Description.. TWI Peripheral The CT and CT contacts have to be soldered in order to use the SDA and SCL alternate P. and P.0 port configuration on the SPI connector (J). In order to use these signals on the J extension connector (SDA and SCL), the CT and CT contacts have to also be soldered... SPI Peripheral.. LED Controller The ATCA controller includes an LED controller on: P. (LED 0) P. (LED ) P. (LED ) P. (LED ) The on board LEDs can be controlled with the ATCA if the corresponding contacts CT, CT0, CT and CT are bypassed. Figure -. On-board LEDs for LED Controller LED 0 LED LED LED 0 LED CT CT0 CT CT ATCA Starter Kit Hardware User Guide - A USB /0

10 Hardware Description. External Connectors These two external connectors to build a customer extended board easily. Figure -. Top View of J and J Connectors P.0 P. P. P. P. P. P. P. P.0 P. P. P. P. P. P. - WR P. - RD J SDA SCL RESET EA BP A XTAL BUZZER. V. V PSEN P.0 - KBD 0 P. - KBD P. - KBD P. - KBD P. - KBD P. - KBD P. - KBD P. - KBD J P0.0 P0. P0. P0. P0. P0. P0. P0. P.0 P. P. P. P. P. P. P. P.0 P. - ATCA Starter Kit Hardware User Guide A USB /0

11 Section Device Programming. In-System Programming The user memory of the ATCA part can be programmed using the ISP mode of the device. In order to enter in ISP mode, first select the high pin count mode (PSEN) or the low pin count mode (P.0) using the ISP switch (SW). To enter in ISP mode, press both the RESET (SW) and ISP (SW) buttons simultaneously. First release the RESET button and then the ISP button. The device enters in ISP mode. ISP can then be performed using the USB bus (or with the peripheral corresponding with the bootloader version). The user may need to re-enumerate the USB bus using the USB UNLOAD button (SW) if the USB cable is already connected.. Using a Programmer The ATCA microcontroller can also be programmed using a programmer with the J connector. Connect all required signals between the programmer and the J connector and remove the J jumper to disconnect the EA circuitry. No clock should be enabled on the board, except the clock coming from the J connector. Figure -. J Connector Schematic J XTAL RST P. (Test0) P. (Test) 0 ATCA Starter Kit Hardware User Guide - Rev. A USB /0

12 Section Appendix ATCA Starter Kit Hardware User Guide - Rev. A USB /0

13 Appendix. Electrical Schematics R xd_µc RxD_µC P_0 Vbus SW P_0 J Vbus SW C C R CT CONTACT J C C R CT CONTACT 0 nf 0 nf. nf K Vbus. nf K Vbus USB_CON_D- R USB Unload USB_CON_D- R USB_CON_D+. K USB Unload R D D USB_CON_D+. K R D D D GND R 00 LED RED D GND R D+ 00 LED RED D+ D+ Rx LED D- D+ Rx LED D- D- USB B D- USB B R U R U P P TxD_µC P_ TxD_µC TOUT TIN TxD_µC TxD_µC TOUT TIN TOUT TIN 0 P_ TOUT TIN 0 CT CONTACT R CT CONTACT R R x_pc R xd_µc RIN ROUT K Rx_PC RxD_µC RIN ROUT K Tx_PC RIN ROUT Tx_PC RIN ROUT C+ D C 0. µf C+ D C 0. µf TP L ED GREEN C 0. µf C 0. µf TP LED GREEN V+ GND C- V+ C Tx LED V+ 0. µf USB_CON_D+ D+ TP GND C- V+ C Tx LED USB_CON_D+ V- 0. µf D+ TP C+ V- V- C C+ V- C C C RS Female C 0. µf C 0. µf RS Female C 0. µf C 0. µf USB_CON_D- TP USB_CON_D- TP MAX0ECSE MAX0ECSE D - TP D- TP J J C- C- GND GND CT CONTACT CT CONTACT CT CONTACT CT CONTACT P_ SDA TWI_CON_SDA Generic_SDA Generic_SDA P_ SDA S CL TWI_CON_SDA TWI_CON_SCL Generic_SDA Generic_SCL B P_0 SCL Generic_SDA TWI_CON_SCL Generic_SCL Generic_SCL B B P_0 Generic_SCL B CT CONTACT CT CONTACT CT CONTACT CT CONTACT J J TWI_CON_SDA TWI_CON_SDA TWI_CON_SCL TWI_CON_SCL GND GND R R. K. K R. K R. K SPI Male SPI Male CONNECTOR SIP RA CONNECTOR SIP RA 0 0 _SS _SS M ISO MISO SCK SCK M OSI MOSI GND GND XTAL XTAL Vpp Vpp T est0 Test0 T est Test P_ P_ P_ P_ P_ P_ P_ P_ XTAL XTAL P_ P_ P_ P_ CONNECTOR SIP RA CONNECTOR SIP RA J LPC Test Mode Male J LPC Test Mode Male TWI Male A TWI Male A A A T itle Title ATC Evab_.0. - Bus ATC Evab_.0. - Bus Size Document Number Rev Size Document Number Rev A.0. A.0. Date: Date: Friday, October, 00 Friday, October, 00 S heet Sheet of of - ATCA Starter Kit Hardware User Guide A USB /0

14 Appendix J J _CPU P_0 P0_0._V P_0 P0_0._V P_ D P0_._V P_ P0_._V D Generic_SDA TWI_soft_sda P_ P0_ P_ P0_ Generic_SCL TWI_soft_scl P_ P0_ P_ P0_ 0 P_ P0_ P_ P0_ 0 _G _G P_ P0_ P_ P0 EA _EA P_ P0_ P_ P0_ BP P_ P0_ P_ P0_ A P_0 P_0 P_0 P_0 0 P_ P_ P_ P_ 0 P_ P_ P_ P_ XTAL_G XTAL P_ P_ P PSEN P PSEN P_ P_ P_ P_ P_ P_ P_ P_ 0 _WR P_ P_ Keyb_0 P_0 P_ 0 _RD P_ P_ Keyb_ P_ P_ P_0 Keyb_ P_ P_0 P_ Keyb_ P_ P_ Keyb_ P_ C 0 0 Keyb_ P_ C Keyb_ P_ Buzzer Keyb_ P_ HEADER X C Generic Left HEADER X C Generic Right CT CONTACT P_ BP B B Buzzer JP P_ A_Buzz Jumper A A A Title ATC Evab_.0. - C Generic Board Connectors Size Document Number Rev A.0. Date: Friday, October, 00 Sheet of ATCA Starter Kit Hardware User Guide - A USB /0

15 Appendix XTAL XTAL_G _G _L XTAL_G _G CT CONTACT Closed for v.0.0 MAX0SCSA P0_0 P0_0 Closed for v.0.0 U D+ P0.0/AD0/D0 P0_ D+ D- D+ P0./AD/D P0_ P0_ D D D- P0_ CONTACT P0_ PFI PFO D- P0./AD/D P0_ CT P0./AD/D P0 SW P0./AD/D 0 P0_ SW ISP Switch P0_ MR RST P0_ R P0./AD/D P0_ P0 PSEN P0./AD/D P0_ RST P0_ C P_0 P0./AD/D. K P_0 P_0 P_ P.0/SCL P_0 P_0 Not Mounted for v.0.0 P_ P./SDA P.0/A/D P_ P_ µf SW P_ P./A/D P_ P_ P_ RESET P_ P./CEX/KIN/MOSI P./A0/D0 P_ P_ P_ C P_ P./CEX/KIN/SCK P./A/D P_ P_ P_ P_ P./CEX/KIN/MISO P./A/D 0 R P_ P_ P_ P_ P./CEX/KIN P./A/D 0 K P_ P_ 0 P_ 0. µf J P_ P./A/D R0 P./CEX0/KIN P_ P_ P_ P_ P_ P./A/D. K P./ECI/KIN J P_ J P_0 P./TEX/KIN/SS P_0 P.0/T/KIN0 _EA _EA C SW XTAL ECI P_ XTAL EA _PSEN _PSEN C INT0 XTAL XTAL XTAL PSEN P_ P_ INT0 XTAL P./RD/LED SW P_ P_ P./WR/LED ISP P_ P_ SYS CLK RST P./T/LED PCA CLK P_ P_ P_0 P./T0 P_ P_0 0 P_ P_ P.0/RxD P./INT/LED0 P_ P_ P./TxD P./INT0 0 P_ UCAP 00 nf 0 nf CT CONTACT D P_ LED0 P_ nc nc B B P_ P./A/D nc P_ P./A/D P0./AD/D C LED0 LED PWR GREEN XTAL XTAL P./A/D P0./AD/D XTAL XTAL RST CT CONTACT D P_ LED P_ XTAL P0./AD/D pf Y P_ P./A/D C CRYSTAL XTAL VDD P./A/D nc LED LED PWR GREEN VDD P0./AD/D 0 pf 0 UCAP P./RD/LED CT0CONTACT D P_ LED UCAP P0./AD/D P0./AD/D P_0 P0./AD/D LED LED PWR GREEN nc P.0/RxD P./WR/LED R CTCONTACT nc nc 0 K J0 D P_ LED nc nc0 _EA LED LED PWR GREEN A A C C EA ATCA-M_ Title R D ATC Evab_.0.0- CPU 00 nf 0 nf _L K Size Document Number Rev LED RED A.0. VDD D- D+ _EA _PSEN P_ P_ P_ P_ P_ UCAP P_ P_0 P_ P_ P_ P_ P_ P_0 P0_0 P_ P_ P_ P_ P_0 GND U µf C 0 0 nc nc D- D+ U EA PSEN P./TxD P./INT0 P./INT/LED0 P./T0 P./T/LED nc nc P./SDA P.0/SCL P./CEX/KIN/MOSI P./CEX/KIN/SCK 0 P./CEX/KIN/MISO P./A0/D0 P./A/D P.0/A/D P0.0/AD0/D0 P./CEX/KIN P./CEX0/KIN P./ECI/KIN P./TEX/KIN/SS P.0/T/KIN0 0 nc UCAP U nc nc VDD C C0 ATC_ U Date: Thursday, May, 00 Sheet of - ATCA Starter Kit Hardware User Guide A USB /0

16 Appendix XTAL XTAL_G _G _L XTAL_G _G CT CONTACT Closed for v.0.0 MAX0SCSA P0_0 P0_0 Closed for v.0.0 U D+ P0.0/AD0/D0 P0_ D+ D- D+ P0./AD/D P0_ P0_ D D D- P0_ CONTACT P0_ PFI PFO D- P0./AD/D P0_ CT P0./AD/D P0 SW P0./AD/D 0 P0_ SW ISP Switch P0_ MR RST P0_ R P0./AD/D P0_ P0 PSEN P0./AD/D P0_ RST P0_ C P_0 P0./AD/D. K P_0 P_0 P_ P.0/SCL P_0 P_0 Not Mounted for v.0.0 P_ P./SDA P.0/A/D P_ P_ µf SW P_ P./A/D P_ P_ P_ RESET P_ P./CEX/KIN/MOSI P./A0/D0 P_ P_ P_ C P_ P./CEX/KIN/SCK P./A/D P_ P_ P_ P_ P./CEX/KIN/MISO P./A/D 0 R P_ P_ P_ P_ P./CEX/KIN P./A/D 0 K P_ P_ 0 P_ 0. µf J P_ P./A/D R0 P./CEX0/KIN P_ P_ P_ P_ P_ P./A/D. K P./ECI/KIN J P_ J P_0 P./TEX/KIN/SS P_0 P.0/T/KIN0 _EA _EA C SW XTAL ECI P_ XTAL EA _PSEN _PSEN C INT0 XTAL XTAL XTAL PSEN P_ P_ INT0 XTAL P./RD/LED SW P_ P_ P./WR/LED ISP P_ P_ SYS CLK RST P./T/LED PCA CLK P_ P_ P_0 P./T0 P_ P_0 0 P_ P_ P.0/RxD P./INT/LED0 P_ P_ P./TxD P./INT0 0 P_ UCAP 00 nf 0 nf CT CONTACT D P_ LED0 P_ nc nc B B P_ P./A/D nc P_ P./A/D P0./AD/D C LED0 LED PWR GREEN XTAL XTAL P./A/D P0./AD/D XTAL XTAL RST CT CONTACT D P_ LED P_ XTAL P0./AD/D pf Y P_ P./A/D C CRYSTAL XTAL VDD P./A/D nc LED LED PWR GREEN VDD P0./AD/D 0 pf 0 UCAP P./RD/LED CT0CONTACT D P_ LED UCAP P0./AD/D P0./AD/D P_0 P0./AD/D LED LED PWR GREEN nc P.0/RxD P./WR/LED R CTCONTACT nc nc 0 K J0 D P_ LED nc nc0 _EA LED LED PWR GREEN A A C C EA ATCA-M_ Title R D ATC Evab_.0.0- CPU 00 nf 0 nf _L K Size Document Number Rev LED RED A.0. VDD D- D+ _EA _PSEN P_ P_ P_ P_ P_ UCAP P_ P_0 P_ P_ P_ P_ P_ P_0 P0_0 P_ P_ P_ P_ P_0 GND U µf C 0 0 nc nc D- D+ U EA PSEN P./TxD P./INT0 P./INT/LED0 P./T0 P./T/LED nc nc P./SDA P.0/SCL P./CEX/KIN/MOSI P./CEX/KIN/SCK 0 P./CEX/KIN/MISO P./A0/D0 P./A/D P.0/A/D P0.0/AD0/D0 P./CEX/KIN P./CEX0/KIN P./ECI/KIN P./TEX/KIN/SS P.0/T/KIN0 0 nc UCAP U nc nc VDD C C0 ATC_ U Date: Thursday, May, 00 Sheet of ATCA Starter Kit Hardware User Guide - A USB /0

17 Appendix over_limiter over_limiter Limiter Limiter Jumper Jumper J P JP J P JP TPS0AD TPS0AD D D Power Power Supply Supply D D U U Vbus Vbus limiter_in limiter_in R IN IN limiter_out limiter_out Power Power Source Source Jumper Jumper U U LM0/TO REG_IN REG_IN IN IN OUT OUT R REG_OUT ADJ C C C C Power Power Switch Switch C C D D R 0 R0 C C D D 0. µf 0. µf S MBJ.0A SMBJ.0A 0 µf 0 TANTAL. µf TANTAL. J C J CONNECTOR SIP SIP MRA00 MRA00 -% -% REG_FB REG_FB V V Power Power Supply Supply._V._V C 0 C0 0. µf 0. µf J J V Male V Male Charge Charge Power Power Vbus Vbus J P JP J J CONNECTOR JACK JACK PWR PWR TP TP Vbus Vbus TP TP Level Level jumper jumper Power Power Supply Supply U U REG_FB REG_FB REG_IN REG_IN B B B B Power Power Supply Supply TP J P R -% Power Power Supply Supply GND GND GND GND C C POWER POWER 0 µf GND TP GND TP 0 µf GND TP GND TP R R -% -% Regulator Regulator Jumper Jumper GND C 0. µf 0 K OUT OUT OUT C 0 µf SW D 0 D0 N00 N00 R TP TP TP D F00S DF00S Vbus Vbus R IN IN ADJ TP JP R -% GND 0 K OC EN OC EN OUT OUT OUT C 0 µf SW R 0 TP TP C 0. µf TP V cc R REG_OUT D D CTCONTACT POWER POWER A A A A R R K K Power Power LED LED RED RED T itle Title ATC ATC Evab_.0. Evab_.0. - POWER - POWER Size Size Document Document Number Number Rev Rev A A Date: Date: Friday, Friday, October October, 00, 00 S heet Sheet of of - ATCA Starter Kit Hardware User Guide A USB /0

18 Appendix. Component Placement Figure -. ATCA Evaluation Board Overview INT A BUZZ _SS MISO SCK MOSI SPI PCA GND GEN CONN CHIP TWI RX TX RS BATT - + V EA 0 ATCA Evab.0. PWR.S. GND D+ D- 0 USB LIM 0 REG V 0 USB.V CRYSTAL UNLOAD LED PWR PWR POWER PSEN P.0 ICC OFF SDA SCL TWI GND ON SYS CLK LPC TEST MODE ISP INT0 RST GND Figure -. ATCA Evaluation Board Component Implementation J J J J0 CT TP JP J J U J CT CT U Y CT CT P SW SW CT D CT D SW D D D TP TP J D CT J SW TP JP CT CT0 CT J JP JP CT SW SW JP TP J J D D TP J ATCA Starter Kit Hardware User Guide - A USB /0

19 Appendix. Mechanical Outlines Figure -. ATCA Evaluation Board Mechanical Outlines. mm.0 mm. mm.0 mm TOP Top view.0 mm mm LEFT C Generic Board s Left connector. mm (*. mm) C Generic Board s Right connector.00 mm. mm RIGHT BOTTOM. mm. Bill of Materials Table -. Bill of Materials Reference Part C, C pf C. nf C, C0, C 0 nf C, C 00 nf C, C, C, C, C, C, C, C, C0, C 0. µf C, C 0 µf R, R R 00 R 0 R, R, R, R K R.K R0.K R, R, R.K R, R, R 0K -0 ATCA Starter Kit Hardware User Guide A USB /0

20 Appendix Table -. Bill of Materials (Continued) Reference D LED GREEN D, D, D LEDs RED D, D, D, D LEDs PWR GREEN D D U U TP, TP, TP, TP, TP, TP MRA00 SMBJ.0A MAX0ECSE DF00S TEST POINTS J, J0, J JUMPER J CONNECTOR JACK PWR J, J CONNECTORS B P J SUB-D FEM USB B J, J HEADER X J J J J SW, SW U U CT, CT, CT, CT, CT, CT, CT, CT, CT, CT0, CT, CT, CT, CT C D0 JP JP JP JP JP CONNECTOR SIP CONNECTOR SIP RA CONNECTOR SIP RA CONNECTOR HE0 SW KEY-SPDT ATCA_ ATCA_VQFP CONTACT 0 µf TANTAL N00 A_Buzz Jumper Limiter Jumper Power Source Jumper Regulator Jumper V CC Level jumper R0 -% R -% R -% SW Part CONTACT BREAKER ATCA Starter Kit Hardware User Guide - A USB /0

21 Appendix Table -. Bill of Materials (Continued) Reference SW, SW, SW U U U Y Part PUSH-BUTTON MAX0SCSA TPS0AD LM0/TO CRYSTAL ATCA Starter Kit Hardware User Guide - A USB /0

22 Atmel Corporation Orchard Parkway San Jose, CA Tel: (0) -0 Fax: (0) -00 Regional Headquarters Europe Atmel Sarl Route des Arsenaux Case Postale 0 CH-0 Fribourg Switzerland Tel: () -- Fax: () --00 Asia Room Chinachem Golden Plaza Mody Road Tsimshatsui East Kowloon Hong Kong Tel: () - Fax: () - Japan F, Tonetsu Shinkawa Bldg. -- Shinkawa Chuo-ku, Tokyo 0-00 Japan Tel: () -- Fax: () -- Atmel Operations Memory Orchard Parkway San Jose, CA Tel: (0) -0 Fax: (0) - Microcontrollers Orchard Parkway San Jose, CA Tel: (0) -0 Fax: (0) - La Chantrerie BP 00 0 Nantes Cedex, France Tel: () Fax: () ASIC/ASSP/Smart Cards Zone Industrielle 0 Rousset Cedex, France Tel: () Fax: () East Cheyenne Mtn. Blvd. Colorado Springs, CO 00 Tel: () -00 Fax: () 0- Scottish Enterprise Technology Park Maxwell Building East Kilbride G 0QR, Scotland Tel: () Fax: () -- RF/Automotive Theresienstrasse Postfach 0 Heilbronn, Germany Tel: () ---0 Fax: () East Cheyenne Mtn. Blvd. Colorado Springs, CO 00 Tel: () -00 Fax: () 0- Biometrics/Imaging/Hi-Rel MPU/ High Speed Converters/RF Datacom Avenue de Rochepleine BP Saint-Egreve Cedex, France Tel: () Fax: () literature@atmel.com Web Site Disclaimer: Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company s standard warranty which is detailed in Atmel s Terms and Conditions located on the Company s web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel s products are not authorized for use as critical components in life support devices or systems. Atmel Corporation 00. All rights reserved. Atmel and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper. A USB /0 /xm

8051 Microcontrollers. Application Note. Migration from AT89C5131 & AT89C5131A-L to AT89C5131A-M

8051 Microcontrollers. Application Note. Migration from AT89C5131 & AT89C5131A-L to AT89C5131A-M Migration from AT89C5131 & AT89C5131A-L to AT89C5131A-M This application note is a guide to assist current AT89C5131 & AT89C5131A-L users in converting existing designs to the AT89C5131A-M devices. In