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DOC7707 bảng dữ liệu(PDF) 156 Page - List of Unclassifed Manufacturers

tên linh kiện DOC7707
Giải thích chi tiết về linh kiện  Microcontroller with 8/16K Bytes of ISP Flash and USB Controller
PDF  307 Pages
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nhà sản xuất  ETC1 [List of Unclassifed Manufacturers]
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DOC7707 bảng dữ liệu(HTML) 156 Page - List of Unclassifed Manufacturers

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7707F–AVR–11/10
AT90USB82/162
bits of the data read from the UDRn will be masked to zero. The USART has to be initialized
before the function can be used.
Note:
1. See “About Code Examples” on page 7.
The function simply waits for data to be present in the receive buffer by checking the RXCn Flag,
before reading the buffer and returning the value.
17.6.2
Receiving Frames with 9 Data Bits
If 9-bit characters are used (UCSZn=7) the ninth bit must be read from the RXB8n bit in
UCSRnB before reading the low bits from the UDRn. This rule applies to the FEn, DORn and
UPEn Status Flags as well. Read status from UCSRnA, then data from UDRn. Reading the
UDRn I/O location will change the state of the receive buffer FIFO and consequently the TXB8n,
FEn, DORn and UPEn bits, which all are stored in the FIFO, will change.
The following code example shows a simple USART receive function that handles both nine bit
characters and the status bits.
Assembly Code Example
(1)
USART_Receive:
; Wait for data to be received
sbis
UCSRnA, RXCn
rjmp
USART_Receive
; Get and return received data from buffer
in
r16, UDRn
ret
C Code Example(1)
unsigned char
USART_Receive( void )
{
/* Wait for data to be received */
while
( !(UCSRnA & (1<<RXCn)) )
;
/* Get and return received data from buffer */
return
UDRn;
}



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