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AT80SND1C-ROTIL 데이터시트(PDF) 139 Page - ATMEL Corporation |
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AT80SND1C-ROTIL 데이터시트(HTML) 139 Page - ATMEL Corporation |
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139 / 210 page ![]() 139 AT8xC51SND1C 4109E–8051–06/03 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 107 the selection is done using SMOD1 bit in PCON register. Figure 108 gives the baud rate calculation formula depending on the selection. Figure 107. Baud Rate Generator Selection (Mode 2) Table 124. 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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