T89C51AC2-SLSIM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'T89C51AC2-SLSIM' PDF : 121 Pages View PDF
Figure 6. Mode Switching Waveforms
XTAL1
XTAL1/2
X2 bit
CPU clock
STD Mode
X2 Mode
STD Mode
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.
16 A/T89C51AC2
4127H–8051–02/08
Share Link: 
