AT89C51IC2 Atmel Corporation, AT89C51IC2 Datasheet

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AT89C51IC2

Manufacturer Part Number
AT89C51IC2
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of AT89C51IC2

Flash (kbytes)
32 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
34
Spi
1
Twi (i2c)
1
Uart
1
Sram (kbytes)
1.25
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART
Watchdog
Yes

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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
Errata Description
1. During UART Reception, Clearing REN May Generate Unexpected IT
2. 32 kHz Oscillator Needs External Feedback Resistor
3. Timer 2 – Baud Rate Generator – Long Start Time
4. Strech MOVX Does not Work
Lot Number
All
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.
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.
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.
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

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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 ...

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