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型號(hào)：	MQ80C52TXXX-20/883D
廠商：	TEMIC SEMICONDUCTORS
元件分類(lèi)：	微控制器/微處理器
英文描述：	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	330/604頁(yè)
文件大?。?/td>	22337K
代理商：	MQ80C52TXXX-20/883D

42073A-MCU Wireless-02/13

ATmega2564/1284/644RFR2

Bit 3:0 – UBRR11:8 - USART Baud Rate Register

These bits represent bits [11:8] of the Baud Rate Register. Sample values for

commonly used clock frequencies can be found in section "Examples of Baud Rate

23.10.12 UBRR1L – USART1 Baud Rate Register Low Byte

Initial Value

UBRR1 is a 12-bit register which contains the USART baud rate. The UBRR1H

contains the four most significant bits, and the UBRR1L 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 UBRR1L will trigger an

immediate update of the baud rate prescaler.

Bit 7:0 – UBRR7:0 - USART Baud Rate Register

These bits represent bits [7:0] of the Baud Rate Register. Sample values for commonly

used clock frequencies can be found in section "Examples of Baud Rate Setting".

23.11 Examples of Baud Rate Setting

For standard crystal and resonator frequencies, the most commonly used baud rates for

asynchronous operation can be generated by using the UBRR settings in Table 23-14

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 384). The error values are calculated using the following equation:

Table 23-14. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies

fOSC = 1.8432 MHz

fOSC = 2.0000 MHz

fOSC = 3.6864 MHz

U2Xn = 0

U2Xn = 1

U2Xn = 0

U2Xn = 1

U2Xn = 0

U2Xn = 1

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