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ATmega32U2 Datasheet(PDF) 171 Page - ATMEL Corporation |
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ATmega32U2 Datasheet(HTML) 171 Page - ATMEL Corporation |
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171 / 314 page  171 7799B–AVR–07/09 ATmega8U2/16U2/32U2 18.11.5 UCSRnD – USART Control and Status Register n D • Bits 1 – CTSEN : USART CTS Enable Set this bit to one by firmware to enable the transmission flow control (CTS). Transmission is allowed if CTS = 0. Set this bit to zero by firmware to disable the transmission flow control (CTS). Transmission is always allowed. • Bits 0 – RTSEN : USART RTS Enable Set this bit to one by firmware to enable the receive flow control (RTS). Set this bit to zero by firmware to disable the receive flow control (RTS). 18.11.6 UBRRnL and UBRRnH – USART Baud Rate Registers • Bit 15:12 – Reserved Bits These bits are reserved for future use. For compatibility with future devices, these bit must be written to zero when UBRRH is written. • Bit 11:0 – UBRR[11:0]: USART Baud Rate Register This is a 12-bit register which contains the USART baud rate. The UBRRH contains the four most significant bits, and the UBRRL contains the eight least significant bits of the USART baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if the baud rate is changed. Writing UBRRL will trigger an immediate update of the baud rate prescaler. 18.12 Examples of Baud Rate Setting For standard crystal and resonator frequencies, the most commonly used baud rates for asyn- chronous operation can be generated by using the UBRR settings in Table 18-9 to Table 18-12. UBRR values which yield an actual baud rate differing less than 0.5% from the target baud rate, are bold in the table. Higher error ratings are acceptable, but the Receiver will have less noise resistance when the error ratings are high, especially for large serial frames (see “Asynchronous Operational Range” on page 163). The error values are calculated using the following equation: Bit 7 6 543 2 1 0 - - - - - - CTSEN RTSEN UCSRnD Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 15 14 13121110 9 8 –––– UBRR[11:8] UBRRnH UBRR[7:0] UBRRnL 76543210 Read/Write RRRR R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 00000000 00000000 Error[%] BaudRate Closest Match BaudRate -------------------------------------------------------- 1 – ⎝⎠ ⎛⎞ 100% • = |
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