Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 154)

154

ATmega8515(L)

2512A–AVR–04/02

• Bit 3 – USBS: Stop Bit Select

Thisbit selects the number ofstopbits to beinsertedbytheTransmitter.TheReceiver

ignores thissetting.

• Bit 2:1 – UCSZ1:0: Character Size

The UCSZ1:0 bitscombinedwith the UCSZ2 bit in UCSRBsets the number ofdata bits

(charactersize) in a frame the receiver and transmitter use.

• Bit 0 – UCPOL: Clock Polarity

Thisbit is usedforSynchronous modeonly. Write thisbit to zero when Asynchronous

modeis used.The UCPOL bit sets the relationshipbetween data output change and

data input sample, and the synchronousclock (XCK).

Table 64. UPMBitsSettings

UPM1 UPM0 Parity Mode

00Disabled

01Reserved

10Enabled, Even Parity

11Enabled, Odd Parity

Table 65. USBS Bit Settings

USBS Stop Bit(s)

01-bit

12-bit

Table 66. UCSZ BitsSettings

UCSZ2 UCSZ1 UCSZ0 Character Size

0005-bit

0016-bit

0107-bit

0118-bit

100Reserved

101Reserved

110Reserved

1119-bit

Table 67. UCPOL Bit Settings

UCPOL

Transmitted Data Changed

(OutputofTxDPin)

Received Data Sampled

(Input on RxD Pin)

0 Falling XCK Edge Rising XCK Edge

1Rising XCK Edge Falling XCK Edge

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 222 223

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Rainbow-electronics ATmega8515L Manual de usuario Pagina 154