Rainbow Electronics T89C5115 - Manual (Page 15)

15
T89C5115
4128A–8051–04/02
Figure 4. 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.
XTAL2
XTAL1
CPU
clock
X2 bit
X2
Mode STD
Mode STD
Mode