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AT90PWM2 Datasheet(PDF) 210 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 210 Page - ATMEL Corporation |
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210 / 361 page  210 4317J–AVR–08/10 AT90PWM2/3/2B/3B 19. EUSART (Extended USART) The Extended Universal Synchronous and Asynchronous serial Receiver and Transmitter (EUSART) provides functionnal extensions to the USART. 19.1 Features • Independant bit number configuration for transmit and receive • Supports Serial Frames with 5, 6, 7, 8, 9 or 13, 14, 15, 16, 17 Data Bits and 1 or 2 Stop Bits • Biphase Manchester encoder/decoder (for DALI Communications) • Manchester framing error detection • Bit ordering (MSB first or LSB first) 19.2 Overview A simplified block diagram of the EUSART Transmitter is shown in Figure 19-1. CPU accessible I/O Registers and I/O pins are shown in bold. Figure 19-1. EUSART Block Diagram The EUSART is activated with the EUSART bit of EUCSRB register. Until this bit is not set, the USART will behave as standard USART, all the functionnalities of the EUSART are not accessible. The EUSART supports more serial frame formats than the standard USART interface: Table 18-12. Examples of UBRR Settings for Commonly Frequencies (Continued) Baud Rate (bps) fclk io = 12.0000 MHz fclk io = 14.7456 MHz fclk io = 16.0000 MHz U2X = 0 U2X = 1 U2X = 0 U2X = 1 U2X = 0 U2X = 1 UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error 2400 312 -0.2% 624 0.0% 383 0.0% 767 0.0% 416 -0.1% 832 0.0% 4800 155 0.2% 312 -0.2% 191 0.0% 383 0.0% 207 0.2% 416 -0.1% 9600 77 0.2% 155 0.2% 95 0.0% 191 0.0% 103 0.2% 207 0.2% 14.4k 51 0.2% 103 0.2% 63 0.0% 127 0.0% 68 0.6% 138 -0.1% 19.2k 38 0.2% 77 0.2% 47 0.0% 95 0.0% 51 0.2% 103 0.2% 28.8k 25 0.2% 51 0.2% 31 0.0% 63 0.0% 34 -0.8% 68 0.6% 38.4k 19 -2.5% 38 0.2% 23 0.0% 47 0.0% 25 0.2% 51 0.2% 57.6k 12 0.2% 25 0.2% 15 0.0% 31 0.0% 16 2.1% 34 -0.8% 76.8k 9 -2.7% 19 -2.5% 11 0.0% 23 0.0% 12 0.2% 25 0.2% 115.2k 6 -8.9% 12 0.2% 7 0.0% 15 0.0% 8 -3.5% 16 2.1% 230.4k 2 11.3% 6 -8.9% 3 0.0% 7 0.0% 3 8.5% 8 -3.5% 250k 2 0.0% 5 0.0% 3 -7.8% 6 5.3% 3 0.0% 7 0.0% 500k – – 2 0.0% 1 -7.8% 3 -7.8% 1 0.0% 3 0.0% 1M – – – – 0 -7.8% 1 -7.8% 0 0.0% 1 0.0% Max. (1) 750 kbps 1.5 Mbps 921.6 kbps 1.8432 Mbps 1 Mbps 2 Mbps 1. UBRR = 0, Error = 0.0% |
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