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AT89C51RC2-3CSIM Datasheet(PDF) 48 Page - ATMEL Corporation |
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AT89C51RC2-3CSIM Datasheet(HTML) 48 Page - ATMEL Corporation |
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48 / 127 page  48 AT89C51RB2/RC2 4180C–8051–12/03 Table 32. Baud Rate Selection Table UART 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 21. Internal Baud Rate • The baud rate for UART is token by formula: TCLK (T2CON) RCLK (T2CON) TBCK (BDRCON) RBCK (BDRCON) Clock Source UART Tx Clock Source UART Rx 0000 Timer 1 Timer 1 1000 Timer 2 Timer 1 0100 Timer 1 Timer 2 1100 Timer 2 Timer 2 X 010 INT_BRG Timer 1 X 110 INT_BRG Timer 2 0 X 0 1 Timer 1 INT_BRG 1 X 0 1 Timer 2 INT_BRG X X 1 1 INT_BRG INT_BRG BRG 0 1 /6 BRL /2 0 1 INT_BRG SPD BRR SMOD1 auto reload counter overflow FPER Baud_Rate = 6(1-SPD) ⋅ 32 ⋅ (256 -BRL) 2SMOD1 ⋅ F PER BRL = 256 - 6(1-SPD) ⋅ 32 ⋅ Baud_Rate 2 SMOD1 ⋅ F PER |
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