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AS7221 bảng dữ liệu(PDF) 17 Page - ams AG

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Page 17
[v1-01] 2016-Dec-08
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AS7221 − Detailed Description
UART and Smart Lighting Command Interface
The UART block implements the TX and RX signals as defined
in the RS-232 / V.24 standard communication protocol.
UART Feature List
• Full Duplex Operation (Independent Serial Receive and
Transmit Registers) with FIFO buffer of 8 bytes for each.
• Factory set to 115.2k Baud
• Supports Serial Frames with 8 Data Bits, no Parity and
1 Stop Bit.
Operation
Transmission
If data is available in the transmit FIFO, it will be moved into the
output shift register and the data will be transmitted at the
configured Baud Rate, starting with a Start Bit (logic zero) and
followed by a Stop Bit (logic one).
Reception
At any time, with the receiver being idle, if a falling edge of a
start bit is detected on the input, a byte will be received and
stored in the receive FIFO. The following Stop Bit will be checked
to be logic one.
Figure 20:
UART Protocol
Start Bit
TX
D0
D1
D2
D3
D4
D5
D6
D7
D0
D0
D1
D2
D3
D4
D5
D6
D7
D0
Tbit=1/Baude Rate
Stop Bit
Next Start
Sample Points
Start Bit detected
After Tbit/2: Sampling of Start Bit
After Tbit: Sampling of Data
RX
Always Low
Always High
Data Bits



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