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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DOC7707 датащи(PDF) 173 Page - List of Unclassifed Manufacturers |
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DOC7707 датащи(HTML) 173 Page - List of Unclassifed Manufacturers |
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173 / 307 page  173 7707F–AVR–11/10 AT90USB82/162 18. USART in SPI Mode The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) can be set to a master SPI compliant mode of operation. The Master SPI Mode (MSPIM) has the follow- ing features: • Full Duplex, Three-wire Synchronous Data Transfer • Master Operation • Supports all four SPI Modes of Operation (Mode 0, 1, 2, and 3) • LSB First or MSB First Data Transfer (Configurable Data Order) • Queued Operation (Double Buffered) • High Resolution Baud Rate Generator • High Speed Operation (fXCKmax = fCK/2) • Flexible Interrupt Generation 18.1 Overview Setting both UMSELn1:0 bits to one enables the USART in MSPIM logic. In this mode of opera- tion the SPI master control logic takes direct control over the USART resources. These resources include the transmitter and receiver shift register and buffers, and the baud rate gen- erator. The parity generator and checker, the data and clock recovery logic, and the RX and TX Table 17-12. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued) Baud Rate (bps) f osc = 16.0000 MHz f osc = 18.4320 MHz f osc = 20.0000 MHz U2Xn = 0U2Xn = 1U2Xn = 0U2Xn = 1U2Xn = 0U2Xn = 1 UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error 2400 416 -0.1% 832 0.0% 479 0.0% 959 0.0% 520 0.0% 1041 0.0% 4800 207 0.2% 416 -0.1% 239 0.0% 479 0.0% 259 0.2% 520 0.0% 9600 103 0.2% 207 0.2% 119 0.0% 239 0.0% 129 0.2% 259 0.2% 14.4k 68 0.6% 138 -0.1% 79 0.0% 159 0.0% 86 -0.2% 173 -0.2% 19.2k 51 0.2% 103 0.2% 59 0.0% 119 0.0% 64 0.2% 129 0.2% 28.8k 34 -0.8% 68 0.6% 39 0.0% 79 0.0% 42 0.9% 86 -0.2% 38.4k 25 0.2% 51 0.2% 29 0.0% 59 0.0% 32 -1.4% 64 0.2% 57.6k 16 2.1% 34 -0.8% 19 0.0% 39 0.0% 21 -1.4% 42 0.9% 76.8k 12 0.2% 25 0.2% 14 0.0% 29 0.0% 15 1.7% 32 -1.4% 115.2k 8 -3.5% 16 2.1% 9 0.0% 19 0.0% 10 -1.4% 21 -1.4% 230.4k 3 8.5% 8 -3.5% 4 0.0% 9 0.0% 4 8.5% 10 -1.4% 250k 3 0.0% 7 0.0% 4 -7.8% 8 2.4% 4 0.0% 9 0.0% 0.5M 1 0.0% 3 0.0% – – 4 -7.8% – – 4 0.0% 1M 0 0.0% 1 0.0% –– ––– ––– Max. (1) 1 Mbps 2 Mbps 1.152 Mbps 2.304 Mbps 1.25 Mbps 2.5 Mbps 1. UBRR = 0, Error = 0.0% |
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