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AT89C51AC3-RDTIM Datasheet(PDF) 17 Page - ATMEL Corporation

Part # AT89C51AC3-RDTIM
Description  Enhanced 8-bit Microcontroller with 64KB Flash Memory
PDF  143 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51AC3-RDTIM Datasheet(HTML) 17 Page - ATMEL Corporation

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AT89C51AC3
4383B–8051–01/05
Figure 6. Mode Switching Waveforms
Note:
In order to prevent any incorrect operation while operating in the X2 mode, users must be aware that all peripherals using the
clock frequency as a time reference (UART, timers...) will have their time reference divided by two. For example a free running
timer generating an interrupt every 20 ms will then generate an interrupt every 10 ms. A UART with a 4800 baud rate will have
a 9600 baud rate.
XTAL1/2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
STD Mode



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