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參數(shù)資料
| 型號(hào)： | H8250 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Universal Asynchronous Receiver/Transmitter |
| 中文描述： | 通用異步接收器/發(fā)送器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 49K |
| 代理商： | H8250 |
CAST H8250 Megafunction Datasheet
CAST, Inc.
Page 4
Read from Receiver
The timing diagram that follows depicts the situation where the receiver is in the process of receiving a byte
which is just coming up to the Stop bit. Once a proper Stop bit is received the Byte is placed in the Receiver
Buffer Register. This event is signaled to the processor by the RXRDY signal which goes inactive when a byte is
awaiting reading. The Receiver Buffer Register must be read before the next byte is received or else an error
will be generated.
SIN
RD
RXRDY
STOP
RCLK
Timing information for Read Function
Receiver Synchronization
When the Receiver detects a low state in the incoming data stream it will synchronize to it. After this start edge
the UART will wait 1.5*(the normal bit length). This causes the subsequent bits to be read at the middle of its
width. This figure depicts this synchronization process.
Start bit
Detected
Message
bit Read
Message
bit Read
First
Message bit
Second
Message bit
1.5 bits
Receiver Synchronization
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