AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet

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AT89C51RE2

Manufacturer Part Number
AT89C51RE2
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of AT89C51RE2

Flash (kbytes)
128 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
34
Spi
1
Uart
2
Sram (kbytes)
8.25
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART/OCD
Watchdog
Yes

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Active Errata List
Errata History
Errata Descriptions
1. During UART reception, clearing REN may generate unexpected IT
2. Timer 2 – Baud rate generator
3. Flash
4. Crystal
Lot Number
All
Lot 5T7244 and above
During UART reception, clearing REN may generate unexpected IT
Timer 2 – Baud rate generator – Long start time
Flash – Frequence limitation for flash programming sequence
Flash - Bank1 or bank2 corruption while programming bank0
Crystal - Determine the correct capacitors on Xtal1 and Xtal2
During UART reception, if the REN bit is cleared between start bit detection and
the end of reception, the UART will not discard the data (RI is set).
Workaround
Test REN at the beginning of Interrupt routine directly after CLR RI, and run the
Interrupt routine code only if REN is set.
When Timer 2 is used as a baud rate generator, TH2 is not loaded with RCAP2H
at the beginning, then UART is not operational before 10,000 machine cycles.
Workaround
Add the initialization of TH2 and TL2 in the initialization of Timer 2.
When a flash programming sequence is launched from the application or the boot-
loader, at a very slow frequency, the program is frozen until a new reset.
Workaround
Consequently, the product limitation if the application wants store data in the
flash, is a minimum external frequency of 7 MHz.
Due to new caracteristics of the internal oscillator and to ensure a good start-up of
this oscillator, we advise customer to look the application note “Analyzing the
Behavior of an Oscillator and Ensuring Good startup” available on the web site.
Frequence limitation for flash programming sequence
Determine the correct capacitors on Xtal1 and Xtal2
Long start time
Errata List
1, 2, 3, 4, 5
1, 2, 4, 5
80C51 MCUs
AT89C51RE2
Errata Sheet
Rev. 7665D–8051–03/08

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AT89C51RE2 Summary of contents

Page 1

... Behavior of an Oscillator and Ensuring Good startup” available on the web site. Errata List Long start time – 80C51 MCUs AT89C51RE2 Errata Sheet Rev. 7665D–8051–03/08 ...

Page 2

Flash When the bank1 or the bank2 is mapped in the upper 32K, if the application running in the common bank wants to program data in common bank or bank0, the same data are dupli- cated in bank1 or ...

Page 3

... Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as compo- nents in applications intended to support or sustain life. ©2008 Atmel Corporation. All rights reserved. Atmel tered trademarks, of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...

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