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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST7285C 데이터시트(PDF) 32 Page - STMicroelectronics |
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ST7285C 데이터시트(HTML) 32 Page - STMicroelectronics |
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32 / 117 page  32/117 ST7285C SERIAL COMMUNICATIONS INTERFACE(Cont’d) This TR factor is used only when the PSBRT fine tuning factor is equal to 0; otherwise, TR is re- placed by the PSBRT dividing factor. Bit-2 = SCR2 Receiver rate divisor MSB Bit-1 = SCR1 Receiver rate divisor NSB Bit-0 = SCR0 Receiver rate divisor LSB These 3 bits, in conjunction with the 2 previous bits define the total division applied to the bus clock to yield the receive rate clock in conventional Baud Rate Generator mode.. This RR factor is used only when the PSBRR fine tuning factor is equal to 0; otherwise, RR is re- placed by the PSBRR dividing factor. 4.2.7.6 External Receive Prescaler Division Register (PSCBRR) Address: 0055h — Read/Write Reset Value: 00h Allows setting of the External Prescaler rate divi- sion factor for the receive circuit. When the register is set to 00h, the conventional Baud Rate Generator is used for the receive cir- cuit, otherwise the master clock frequency is divid- ed by the binary factor set in the PSCBRR register (in the range 1 to 255). 4.2.7.7 External Transmit Prescaler Division Register (PSCBRT) Address: 0057h — Read/Write Reset Value: 00h Allows setting of the External Prescaler rate divi- sion factor for the transmit circuit. When the register is set to 00h, the conventional Baud Rate Generator is used for the transmit cir- cuit, otherwise the master clock frequency is divid- ed by the binary factor set in the PSCBRTregister (in the range 1 to 255). SCT2 SCT1 SCT0 TR dividing factor 00 0 1 00 1 2 01 0 4 01 1 8 10 0 16 10 1 32 11 0 64 1 1 1 128 SCR2 SCR1 SCR0 RR dividing factor 00 0 1 00 1 2 01 0 4 01 1 8 10 0 16 10 1 32 11 0 64 1 1 1 128 76 5 4321 0 PRBR 7 PRBR 6 PRBR 5 PRBR 4 PRBR 3 PRBR 2 PRBR 1 PRBR 0 76 5 4321 0 PTBR 7 PTB R 6 PTBR 5 PTB R 4 PTBR 3 PTB R 2 PTBR 1 PTB R 0 |
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