參數(shù)資料
型號: XE8000EV108
廠商: Semtech
文件頁數(shù): 18/143頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XE8806/XE8807
標準包裝: 1
類型: MCU
適用于相關(guān)產(chǎn)品: XE88LC06AMI026
所含物品: 完全組裝的評估板
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
15-7
XE8806A/XE8807A
Asynchronous Reception
read of RegUartRx (software)
reguartrx_shift
word 1
RegUartRx
word 1
shift clock
Rx
start
b0
b6/7
parity
stop
UartRxBusy
UartRxFull
Irq_uart_Rx
Figure 15-2. UART reception timing diagram.
15.8.4
Interrupt or polling
The transmission and reception software can be driven by interruption or by polling the status bits.
Interrupt driven reception: each time an Irq_uart_Rx interrupt is generated, a new word is available in RegUartRx.
The register has to be read before a new word is received.
Interrupt driven transmission: each time the contents of RegUartTx is transferred to the transmission shift register,
an Irq_uart_Tx interrupt is generated. A new word can then be written to RegUartTx.
Reception driven by polling: the UartRxFull bit is to be read and checked. When it is 1, the RegUartRx register
contains new data and has to be read before a new word is received.
Transmission driven by polling: the UartTxFull bit is to read and checked. When it is 0, the RegUartTx register is
empty and a new word can be written to it.
15.9
Software hints
Example of program for a transmission with polling:
1.
The RegUartCmd register and the RegUartCtrl register are initialized (for example: 8 bit word length, odd
parity, 9600 baud, enable UART transmission).
2.
Write a byte to RegUartTx.
3.
Wait untill the UartTxFull bit in RegUartTxSta register equals 0.
4.
Jump to 2 to writing the next byte if the message is not finished.
5.
End of transmission.
Example of program for a transmission with interrupt:
1.
The RegUartCmd register and the RegUartCtrl register are initialized (for example: 8 bit word length, odd
parity, 9600 baud, enable UART transmission).
2.
Write a byte to RegUartTx.
3.
After an interrupt and if the message is not finished, jump to 2
4.
End of transmission.
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