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AT89C51ED2-RDTUM データシート(PDF) 52 Page - ATMEL Corporation |
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AT89C51ED2-RDTUM データシート(HTML) 52 Page - ATMEL Corporation |
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52 / 137 page  52 4235K–8051–05/08 AT89C51RD2/ED2 Table 14-3. Baud Rate Selection Table UART 14.4.1 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 14-5. 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 0 0 0 0 Timer 1 Timer 1 1 0 0 0 Timer 2 Timer 1 0 1 0 0 Timer 1 Timer 2 1 1 0 0 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 0 1 Overflow SPD BDRCON.1 BRG (8 bits) BRL (8 bits) F Clk Periph ÷ 6 BRR BDRCON.4 0 1 SMOD1 PCON.7 ÷ 2 INT_BRG Baud_Rate = 6(1-SPD) ⋅ 32 ⋅ (256 -BRL) 2SMOD1 ⋅ F PER BRL = 256 - 6(1-SPD) ⋅ 32 ⋅ Baud_Rate 2SMOD1 ⋅ F PER |
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