AT89C51CC02CA-TDSUM ATMEL [ATMEL Corporation], AT89C51CC02CA-TDSUM Datasheet - Page 18

• Manufacturer Part Number: AT89C51CC02CA-TDSUM
• Description: Enhanced 8-bit Microcontroller with CAN Controller and Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 4. Mode Switching Waveforms
Note:
18
1. In order to prevent any incorrect operation while operating in the X2 Mode, users must be aware that all peripherals using
AT/T89C51CC02
the clock frequency as a time reference (UART, timers...) will have their time reference divided by 2. For example, a free run-
ning 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
XTAL2
X2 bit
CPU
clock
STD
Mode
(1)
X2
Mode
STD
Mode
4126J–CAN–05/06