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AT89C5131A-RDTUM データシート(PDF) 73 Page - ATMEL Corporation |
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AT89C5131A-RDTUM データシート(HTML) 73 Page - ATMEL Corporation |
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73 / 188 page  73 4337K–USB–04/08 AT89C5130A/31A-M 15.3.1 Baud Rate Selection Table for UART 15.3.2 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 15-5. Internal Baud Rate • The baud rate for UART is token by formula: Table 15-1. SCON Register – SCON Serial Control Register (98h) 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 BRG 0 1 /6 BRL /2 0 1 INT_BRG SPD BRR SMOD1 auto reload counter overflow Peripheral Clock 7 6 5 4 3 2 1 0 FE/SM0 SM1 SM2 REN TB8 RB8 TI RI Baud_Rate = 2 SMOD1 x FCLK PERIPH 2 x 6 (1-SPD) x 16 x [256 - (BRL)] (BRL) = 256 - 2SMOD1 x FCLK PERIPH 2 x 6 (1-SPD) x 16 x Baud_Rate |
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