AT89C51IC2

Manufacturer Part NumberAT89C51IC2
ManufacturerAtmel Corporation
AT89C51IC2 datasheets
 

Specifications of AT89C51IC2

Flash (kbytes)32 KbytesMax. Operating Frequency60 MHz
Cpu8051-12CMax I/o Pins34
Spi1Twi (i2c)1
Uart1Sram (kbytes)1.25
Self Program MemoryAPIOperating Voltage (vcc)2.7 to 5.5
Timers4IspUART
WatchdogYes  
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Active Errata List
• During UART Reception, Clearing REN may Generate Unexpected IT
• 32 kHz Oscillator Needs External Feedback Resistor
• Timer 2 – Baud Rate Generator – Long Start Time
• Strech MOVX Does Not Work
Errata History
Lot Number
All
Errata Description
1. During UART Reception, Clearing REN May Generate Unexpected IT
During UART reception, if the REN bit is cleared between a 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. 32 kHz Oscillator Needs External Feedback Resistor
Internal feedback resistor is not connected, to start up, the 32 kHz Oscillator
needs an external resistor.
Workaround
Connect XTALB1 and XTALB2 between a 2 MΩ resistor.
3. Timer 2 – Baud Rate Generator – Long Start Time
When Timer 2 is used as baud rate generator, TH2 is not loaded with RCAP2H at
the beginning, then UART is not operational before 10000 machine cycles.
Workaround
Add the initialisation of TH2 and TL2 in the initialisation of Timer 2.
4. Strech 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 lenght but always standart 6 XTAL
lenght. Thus slow external peripherals mapped in the XDATA space could not
work properly.
Workaround
None.
Errata List
1, 2, 3, 4
80C51 MCUs
AT89C51IC2
Errata Sheet
Rev. 4107A–8051–06/02
1

AT89C51IC2 Summary of contents

  • Page 1

    ... When setting M0 bit in AUXR sfr (08Eh), the RD pulse on a MOVX instruction on external memory is not 30 XTAL lenght but always standart 6 XTAL lenght. Thus slow external peripherals mapped in the XDATA space could not work properly. Workaround None. Errata List 80C51 MCUs AT89C51IC2 Errata Sheet Rev. 4107A–8051–06/02 1 ...

  • Page 2

    ... Atmel Corporation 2002. 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 ...