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M68ICS08GR データシート(PDF) 267 Page - Freescale Semiconductor, Inc |
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M68ICS08GR データシート(HTML) 267 Page - Freescale Semiconductor, Inc |
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267 / 408 page ![]() Serial Communications Interface (SCI) I/O Registers MC68HC908GR8 — Rev 4.0 Technical Data MOTOROLA Serial Communications Interface (SCI) 267 Use this formula to calculate the SCI baud rate: where: fBUS = bus frequency PD = prescaler divisor BD = baud rate divisor SCI_BDSRC is an input to the SCI. Normally it will be tied off low at the top level to select the bus clock as the clock source. This makes the formula: Table 18-8 shows the SCI baud rates that can be generated with a 4.9152-MHz bus clock. baud rate f BUS 64 PD BD × × ------------------------------------ = baud rate f BUS 64 PD BD × × ------------------------------------ = Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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