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AT89C51ID2-RDTIM Datasheet(PDF) 57 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM Datasheet(HTML) 57 Page - ATMEL Corporation |
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57 / 159 page  57 AT89C51ID2 4289A–8051–09/03 Table 36. 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 25. 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 00 00 Timer 1 Timer 1 10 00 Timer 2 Timer 1 01 00 Timer 1 Timer 2 11 00 Timer 2 Timer 2 X 0 1 0 INT_BRG Timer 1 X 1 1 0 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 F PER 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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