Hi I am generating external clock of 50% duty cycle 100KHz using AT89c52 using timer2.This external clock I am given to clock input of USART 82c51.I need to another clock frequency to set the baud rates of TXC and RXC inputs of USART 82c51 which need to be 1/32 or 1/64 times the clock given to USART(eg:100KHz/32 or 100KHz/16).
Problem:
How can I divide the 100KHz external clock frequency generated by the AT89c52 to generate the frequency required for RXC and TXC pins of USART.
eg: I need a frequency of 4KHz from the 100KHz external clock frequency.
I am giving the external clock frequency output pin (P1.0) be given to input of another pin(eg:P1.1) and divide the clock to get the desired frequency.
Is there any to perform the division of the clock inside AT89c52? (eg:100KHz/32 or 100KHz/16).
regards raghun
I have no idea what you are talking about, but just in case it is this:
how can I use the UART of the '51 with an external clock, the answer is simple: do as if you used the uC clock, then set the 'counter bit' C/_T bit for T1 in TMOD and attach your external clock to T1in.