Using the information below as help, With the system clock rate is 20MHz, calcul
ID: 3815875 • Letter: U
Question
Using the information below as help, With the system clock rate is 20MHz, calculate the CECOUNT_LIMIT for the Baud rate to be close to 4800 bps.
Configuring the Baud Rate The only data format supported is 8 data bit, no parity, 1 stop bits. There is an internal clock divider eliminating the need for an Baud clock generator. The CECOUNT LIMIT generic allows the device to be configured for a given Baud rate. The received data RxD sample rate Fsx is 16 times faster than the Baud rate Fbaud. The transmitter and receiver operate at the same Baud rate FBaud Baud rate sys System clock frequency Fsx Sampling frequency L COUNT LIMIT Fsx FSys/CECOUNT LIMIT FBaud Fsx/16 FSys/(16 CECOUNT LIMIT)Explanation / Answer
Given,
Fbaud*16=Fsx
=> Fsys/CECOUNT_LIMIT
=>CECOUNT_LIMIT=Fsys/(16*Fbaud) = 25 Mhz /(16*4800) = 323.5208 = 324 (approx)
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