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AT80C51RB2-3CSCM Datasheet(PDF) 38 Page - ATMEL Corporation |
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AT80C51RB2-3CSCM Datasheet(HTML) 38 Page - ATMEL Corporation |
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38 / 83 page  39 AT80C51RD2/AT83C51Rx2 4113B–8051–03/05 Internal Baud Rate Generator (BRG) When the internal Baud Rate Generator is used, the Baud Rates are determined by the BRG overflow depending on the BRL reload value, the value of SPD bit (Speed Mode) in BDRCON register and the value of the SMOD1 bit in PCON register. Figure 18. Internal Baud Rate • The baud rate for UART is token by formula: Peripheral clock BRG 0 1 /6 BRL /2 0 1 INT_BRG BRR auto reload counter overflow SPD BaudRate 2SMOD FCLKPERIPH × 22 6 × × 1 SPD – 〈〉 16 × 256 BRL () – [] × ---------------------------------------------------------------------------------------------------------- = BRL () 256 2SMOD1 FCLKPERIPH × 22 6 × × 1 SPD – () 16 × BaudRate × ----------------------------------------------------------------------------------------- – = |
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