ATMEGA640 datasheet(220/436 Pages) MICROCHIP

220 / 436 page

220

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

22.10.3

UCSRnB – USART Control and Status Register n B

• Bit 7 – RXCIEn: RX Complete Interrupt Enable n

Writing this bit to one enables interrupt on the RXCn Flag. A USART Receive Complete interrupt will be generated

only if the RXCIEn bit is written to one, the Global Interrupt Flag in SREG is written to one and the RXCn bit in

UCSRnA is set.

• Bit 6 – TXCIEn: TX Complete Interrupt Enable n

Writing this bit to one enables interrupt on the TXCn Flag. A USART Transmit Complete interrupt will be generated

only if the TXCIEn bit is written to one, the Global Interrupt Flag in SREG is written to one and the TXCn bit in UCS-

RnA is set.

• Bit 5 – UDRIEn: USART Data Register Empty Interrupt Enable n

Writing this bit to one enables interrupt on the UDREn Flag. A Data Register Empty interrupt will be generated only

if the UDRIEn bit is written to one, the Global Interrupt Flag in SREG is written to one and the UDREn bit in UCS-

RnA is set.

• Bit 4 – RXENn: Receiver Enable n

Writing this bit to one enables the USART Receiver. The Receiver will override normal port operation for the RxDn

pin when enabled. Disabling the Receiver will flush the receive buffer invalidating the FEn, DORn, and UPEn

Flags.

• Bit 3 – TXENn: Transmitter Enable n

Writing this bit to one enables the USART Transmitter. The Transmitter will override normal port operation for the

TxDn pin when enabled. The disabling of the Transmitter (writing TXENn to zero) will not become effective until

ongoing and pending transmissions are completed, that is, when the Transmit Shift Register and Transmit Buffer

port.

• Bit 2 – UCSZn2: Character Size n

The UCSZn2 bits combined with the UCSZn1:0 bit in UCSRnC sets the number of data bits (Character SiZe) in a

frame the Receiver and Transmitter use.

• Bit 1 – RXB8n: Receive Data Bit 8 n

RXB8n is the ninth data bit of the received character when operating with serial frames with nine data bits. Must be

read before reading the low bits from UDRn.

• Bit 0 – TXB8n: Transmit Data Bit 8 n

TXB8n is the ninth data bit in the character to be transmitted when operating with serial frames with nine data bits.

Must be written before writing the low bits to UDRn.

Bit

76543210

RXCIEn

TXCIEn

UDRIEn

RXENn

TXENn

UCSZn2

RXB8n

TXB8n

UCSRnB

Read/Write

R/W

Initial Value

00000000

ATMEGA640 Datasheet(PDF) 220 Page - Microchip Technology

ATMEGA640 Datasheet(HTML) 220 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL