AT89C51RB2

Manufacturer Part NumberAT89C51RB2
ManufacturerAtmel Corporation
AT89C51RB2 datasheets
 

Specifications of AT89C51RB2

Flash (kbytes)16 KbytesMax. Operating Frequency60 MHz
Cpu8051-12CMax I/o Pins32
Spi1Uart1
Sram (kbytes)1.25Self Program MemoryAPI
Operating Voltage (vcc)2.7 to 5.5Timers4
IspUARTWatchdogYes
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Active Errata List
During UART Reception, Clearing REN May Generate Unexpected IT
Timer 2 – Baud Rate Generator – Long Start Time
Stretch MOVX Does Not Work
Timer0/1
Extra Interrupt
Errata History
Lot Number
All
Errata Descriptions
1. During UART Reception, Clearing REN May Generate Unexpected IT
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 just after CLR RI, and run the Inter-
rupt routine code only if REN is set.
2. Timer 2 – Baud Rate Generator
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.
3. Stretch MOVX Does Not Work
When setting M0 bit in AUXR SFR (08Eh), the RD or WR pulse on a MOVX
instruction on external memory is not 30 XTAL length but always standard 6 XTAL
length. Thus slow external peripherals mapping in the XDATA space could not
work properly.
Workaround
None.
4. Timer0/1
Extra Interrupt
When Timer0 is in X1 mode and Timer1 in X2 mode and vice versa, extra inter-
rupt may randomly occur for Timer0 or Timer1.
Workaround
Use the same mode for the two timers.
Errata List
1, 2, 3, 4
Long Start Time
.
80C51 MCUs
AT89C51RB2
AT89C51RC2
Errata Sheet
Rev. 4181C–8051–06/04

AT89C51RB2 Summary of contents

  • Page 1

    ... When Timer0 mode and Timer1 in X2 mode and vice versa, extra inter- rupt may randomly occur for Timer0 or Timer1. Workaround Use the same mode for the two timers. Errata List Long Start Time – . 80C51 MCUs AT89C51RB2 AT89C51RC2 Errata Sheet Rev. 4181C–8051–06/04 ...

  • Page 2

    Active UART Bootloader Errata List • API program Data Byte - Incorrect Return Value • API program Data Page - Incorrect Return Value UART Bootloader Errata History Version Number 0.1 (1.0.1 displayed by FLIP) UART Bootloader Errata Description 1. API ...

  • Page 3

    ... Fax: (81) 3-3523-7581 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 ...