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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72361 датащи(PDF) 127 Page - STMicroelectronics |
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ST72361 датащи(HTML) 127 Page - STMicroelectronics |
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127 / 224 page  ST72361 127/224 LINSCI ™ SERIAL COMMUNICATION INTERFACE (SCI Mode) (Cont’d) 10.7.5.4 Conventional Baud Rate Generation The baud rates for the receiver and transmitter (Rx and Tx) are set independently and calculated as follows: with: PR = 1, 3, 4 or 13 (see SCP[1:0] bits) TR = 1, 2, 4, 8, 16, 32, 64,128 (see SCT[2:0] bits) RR = 1, 2, 4, 8, 16, 32, 64,128 (see SCR[2:0] bits) All these bits are in the SCIBRR register. Example: If fCPU is 8 MHz (normal mode) and if PR = 13 and TR = RR = 1, the transmit and re- ceive baud rates are 38400 baud. Note: The baud rate registers MUST NOT be changed while the transmitter or the receiver is en- abled. 10.7.5.5 Extended Baud Rate Generation The extended prescaler option gives a very fine tuning on the baud rate, using a 255 value prescal- er, whereas the conventional Baud Rate Genera- tor retains industry standard software compatibili- ty. The extended baud rate generator block diagram is described in Figure 3. The output clock rate sent to the transmitter or to the receiver will be the output from the 16 divider divided by a factor ranging from 1 to 255 set in the SCIERPR or the SCIETPR register. Note: The extended prescaler is activated by set- ting the SCIETPR or SCIERPR register to a value other than zero. The baud rates are calculated as follows: with: ETPR = 1, ..., 255 (see SCIETPR register) ERPR = 1, ..., 255 (see SCIERPR register) Tx = (16*PR)*TR fCPU Rx = (16*PR)*RR fCPU Tx = 16*ETPR*(PR*TR) fCPU Rx = 16*ERPR*(PR*RR) fCPU |
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