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CST12.0MTWA Datasheet(PDF) 95 Page - STMicroelectronics |
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CST12.0MTWA Datasheet(HTML) 95 Page - STMicroelectronics |
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95 / 153 page  ST72334J/N, ST72314J/N, ST72124J 95/153 SERIAL COMMUNICATIONS INTERFACE (Cont’d) DATA REGISTER (DR) Read/Write Reset Value: Undefined Contains the Received or Transmitted data char- acter, depending on whether it is read from or writ- ten to. The Data register performs a double function (read and write) since it is composed of two registers, one for transmission (TDR) and one for reception (RDR). The TDR register provides the parallel interface between the internal bus and the output shift reg- ister (see Figure 1.). The RDR register provides the parallel interface between the input shift register and the internal bus (see Figure 1.). BAUD RATE REGISTER (BRR) Read/Write Reset Value: 00xx xxxx (XXh) Bit 7:6= SCP[1:0] First SCI Prescaler These 2 prescaling bits allow several standard clock division ranges: Bit 5:3 = SCT[2:0] SCI Transmitter rate divisor These 3 bits, in conjunction with the SCP1 & SCP0 bits define the total division applied to the bus clock to yield the transmit rate clock in convention- al Baud Rate Generator mode. Note: this TR factor is used only when the ETPR fine tuning factor is equal to 00h; otherwise, TR is replaced by the ETPR dividing factor. Bit 2:0 = SCR[2:0] SCI Receiver rate divisor. These 3 bits, in conjunction with the SCP1 & SCP0 bits define the total division applied to the bus clock to yield the receive rate clock in conventional Baud Rate Generator mode. Note: this RR factor is used only when the ERPR fine tuning factor is equal to 00h; otherwise, RR is replaced by the ERPR dividing factor. 70 DR7 DR6 DR5 DR4 DR3 DR2 DR1 DR0 70 SCP1 SCP0 SCT2 SCT1 SCT0 SCR2 SCR1 SCR0 PR Prescaling factor SCP1 SCP0 10 0 30 1 41 0 13 1 1 TR dividing factor SCT2 SCT1 SCT0 10 0 0 20 0 1 40 1 0 80 1 1 16 1 0 0 32 1 0 1 64 1 1 0 128 1 1 1 RR dividing factor SCR2 SCR1 SCR0 10 0 0 20 0 1 40 1 0 80 1 1 16 1 0 0 32 1 0 1 64 1 1 0 128 1 1 1 |
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