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AT83SND2CMP3 датащи(PDF) 72 Page - ATMEL Corporation |
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AT83SND2CMP3 датащи(HTML) 72 Page - ATMEL Corporation |
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72 / 97 page ![]() 72 AT83SND2CMP3 7524B–MP3–05/06 Notes: 1. These frequencies are achieved in X1 mode, F PER = FOSC ÷ 2. 2. These frequencies are achieved in X2 mode, F PER = FOSC. Baud Rate Selection (Mode 2) In mode 2, the baud rate can only be programmed to 2 fixed values: 1/16 or 1/32 of the peripheral clock frequency. As shown in Figure 70 the selection is done using SMOD1 bit in PCON register. Figure 71 gives the baud rate calculation formula depending on the selection. Figure 70. Baud Rate Generator Selection (Mode 2) Table 56. Internal Baud Rate Generator Value Baud Rate F PER = 6 MHz (1) F PER = 8 MHz (1) F PER = 10 MHz (1) SPD SMOD1 BRL Error % SPD SMOD1 BRL Error % SPD SMOD1 BRL Error % 115200 -- -- --- -- -- - 57600 - - - - 1 1 247 3.55 1 1 245 1.36 38400 1 1 246 2.34 1 1 243 0.16 1 1 240 1.73 19200 1 1 236 2.34 1 1 230 0.16 1 1 223 1.36 9600 1 1 217 0.16 1 1 204 0.16 1 1 191 0.16 4800 1 1 178 0.16 1 1 152 0.16 1 1 126 0.16 Baud Rate F PER = 12 MHz (2) F PER = 16 MHz (2) F PER = 20 MHz (2) SPD SMOD1 BRL Error % SPD SMOD1 BRL Error % SPD SMOD1 BRL Error % 115200 - - - - 1 1 247 3.55 1 1 245 1.36 57600 1 1 243 0.16 1 1 239 2.12 1 1 234 1.36 38400 1 1 236 2.34 1 1 230 0.16 1 1 223 1.36 19200 1 1 217 0.16 1 1 204 0.16 1 1 191 0.16 9600 1 1 178 0.16 1 1 152 0.16 1 1 126 0.16 4800 1 1 100 0.16 1 1 48 0.16 1 0 126 0.16 0 1 SMOD1 PCON.7 PER CLOCK ÷ 2 ÷ 16 To Serial Port |
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