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AT83SND2CMP3B Datasheet(PDF) 173 Page - ATMEL Corporation |
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AT83SND2CMP3B Datasheet(HTML) 173 Page - ATMEL Corporation |
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173 / 241 page ![]() 173 4341F–MP3–03/06 AT8xC51SND2C/MP3B 20.4.4 Baud Rate Selection (Modes 1 and 3) In modes 1 and 3, the Baud Rate is derived either from the Timer 1 or the Internal Baud Rate Generator and allows different baud rate in reception and transmission. As shown in Figure 20-12 the selection is done using RBCK and TBCK bits in BDRCON register. Figure 20-13 gives the baud rate calculation formulas for each baud rate source while Table 20- 2 details Internal Baud Rate Generator configuration for different peripheral clock frequencies and giving baud rates closer to the standard baud rates. Figure 20-12. Baud Rate Source Selection (Modes 1 and 3) Figure 20-13. Baud Rate Formulas (Modes 1 and 3) 0 1 RBCK BDRCON.2 T1 CLOCK To Serial IBRG CLOCK Rx Port 0 1 TBCK BDRCON.3 T1 CLOCK To Serial IBRG CLOCK Tx Port ÷ 16 ÷ 16 Baud_Rate= 6(1-SPD) ⋅ 32 ⋅ (256 -BRL) 2SMOD1 ⋅ F PER BRL= 256 - 6(1-SPD) ⋅ 32 ⋅ Baud_Rate 2 SMOD1 ⋅ F PER Baud_Rate= 6 ⋅ 32 ⋅ (256 -TH1) 2SMOD1 ⋅ F PER TH1= 256 - 192 ⋅ Baud_Rate 2SMOD1 ⋅ F PER a. IBRG Formula b. T1 Formula |
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