T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 19

• Manufacturer Part Number: T89C51CC01
• Description: Enhanced 8-Bit Microcontroller
• Manufacturer: Atmel

Figure 6. Mode Switching Waveforms
Note:
4129K–CAN–01/05
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.
XTAL2
X2 bit
CPU
STD Mode
X2 Mode
T89C51CC01
STD Mode
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