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參數(shù)資料
| 型號(hào)： | MD80C52CXXX-12P883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | 0.600 INCH, CERAMIC, DIP-40 |
| 文件頁(yè)數(shù)： | 106/287頁(yè) |
| 文件大小： | 12910K |
| 代理商： | MD80C52CXXX-12P883 |
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194
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Data Register Empty interrupt (see description of the UDRIEn bit).UDREn is set after a reset to
indicate that the Transmitter is ready.
Bit 4 – FEn: Frame Error
This bit is set if the next character in the receive buffer had a Frame Error when received. I.e.,
when the first stop bit of the next character in the receive buffer is zero. This bit is valid until the
receive buffer (UDRn) is read. The FEn bit is zero when the stop bit of received data is one.
Always set this bit to zero when writing to UCSRnA.
Bit 3 – DORn: Data OverRun
This bit is set if a Data OverRun condition is detected. A Data OverRun occurs when the receive
buffer is full (two characters), it is a new character waiting in the Receive Shift Register, and a
new start bit is detected. This bit is valid until the receive buffer (UDRn) is read. Always set this
bit to zero when writing to UCSRnA.
Bit 2 – UPEn: USART Parity Error
This bit is set if the next character in the receive buffer had a Parity Error when received and the
Parity Checking was enabled at that point (UPMn1 = 1). This bit is valid until the receive buffer
(UDRn) is read. Always set this bit to zero when writing to UCSRnA.
Bit 1 – U2Xn: Double the USART Transmission Speed
This bit only has effect for the asynchronous operation. Write this bit to zero when using syn-
chronous operation.
Writing this bit to one will reduce the divisor of the baud rate divider from 16 to 8 effectively dou-
bling the transfer rate for asynchronous communication.
Bit 0 – MPCMn: Multi-processor Communication Mode
This bit enables the Multi-processor Communication mode. When the MPCMn bit is written to
one, all the incoming frames received by the USART Receiver that do not contain address infor-
mation will be ignored. The Transmitter is unaffected by the MPCMn setting. For more detailed
information see ”Multi-processor Communication mode” on page 191.
19.11.3
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 UCSRnA is set.
Bit
765
4
3
2
1
0
RXCIEn
TXCIEn
UDRIEn
RXENn
TXENn
UCSZn2
RXB8n
TXB8n
UCSRnB
Read/Write
R/W
R
R/W
Initial Value
0
相關(guān)PDF資料 |
PDF描述 |
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| MQ80C32E-12:D | 8-BIT, 12 MHz, MICROCONTROLLER, CQFP44 |
| MQ80C52CXXX-16SBR | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
| MT80C31-20D | 8-BIT, 20 MHz, MICROCONTROLLER, PQFP44 |
| MD80C32E-16SC | 8-BIT, 16 MHz, MICROCONTROLLER, CDIP40 |
| MQ80C52TXXX-16SB | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
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| MD80C86 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
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