RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 13 ASYNCHRONOUS SERIAL INTERFACE LIN-UART (UARTF) Therefore, the maximum baud rate that can be received by the destination is as follows. BRmax = (FLmin/11) 1 22k = Brate 21k + 2 Similarly, obtaining the following maximum allowable transfer rate yields the following. 10 k + 2 21k 2 FLmax = 11 FL FL = FL 11 2 k 2 k 21k 2 FLmax = FL 11 20 k Therefore, the minimum baud rate that can be received by the destination is as follows. BRmin = (FLmax/11) 1 20k = Brate 21k 2 Table 13-10 shows the allowable baud rate error for UARTn and the destination calculated from the above-described equations for obtaining the minimum and maximum baud rate values. Division Ratio (k) Table 13-10. Maximum/Minimum Allowable Baud Rate Error Maximum Allowable Baud Rate Error Minimum Allowable Baud Rate Error BN = 9 BN = 11 BN = 12 BN = 9 BN = 11 BN = 12 4 +2.85% +2.32% +2.12% 3.03% 2.43% 2.22% 8 +4.34% +3.52% +3.22% 4.47% 3.61% 3.29% 20 +5.10% +4.14% +3.78% 5.18% 4.19% 3.82% 50 +5.68% +4.60% +4.20% 5.70% 4.61% 4.21% 100 +5.78% +4.68% +4.27% 5.79% 4.69% 4.28% 256 +5.83% +4.72% +4.31% 5.83% 4.72% 4.31% 512 +5.85% +4.74% +4.33% 5.86% 4.74% 4.33% 1024 +5.87% +4.75% +4.33% 5.87% 4.75% 4.33% 2048 +5.87% +4.75% +4.34% 5.87% 4.75% 4.34% 4095 +3.42% +4.75% +4.34% 3.59% 4.75% 4.34% Remarks 1. The reception accuracy depends on the bit count in 1 frame, the input clock frequency, and the division ratio (k). The higher the input clock frequency and the larger the division ratio (k), the higher the accuracy. 2. BN: Number of bits from the start bit to the stop bit K: Setting values of UFnCTL1.UFnBRS[11:0] R01UH0317EJ0004 Rev. 0.04 781 Feb. 22, 2013
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 13 ASYNCHRONOUS SERIAL INTERFACE LIN-UART (UARTF) 13.11 Cautions for Use (1) Execute a STOP instruction during a LIN-UART operation after stopping LIN-UART. (2) Start up the LIN-UARTn in the following sequence. Set the ports. Set PER0.LINnEN to 1. Set UFnCTL0.UFnTXE to 1, and UFnCTL0.UFnRXE to 1. (3) Stop the LIN-UARTn in the following sequence. Set UFnCTL0.UFnTXE to 0, and UFnCTL0.UFnRXE to 0. Set PER1.LINnEN to 0. Set the ports. (It is not a problem if port setting is not changed.) (4) In transmit mode (UFnCTL0.UFnTXE = 1), do not overwrite the same value to the UFnTX register by software because transmission starts by writing to this register. To transmit the same value continuously, overwrite the same value. Remark n = 0, 1 R01UH0317EJ0004 Rev. 0.04 782 Feb. 22, 2013
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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