參數(shù)資料
型號： XE8807AMI026TLF
廠商： Semtech
文件頁數(shù)： 18/143頁
文件大小： 0K
描述： IC MCU LOW PWR MTP FLASH 32-TQFP
標(biāo)準(zhǔn)包裝： 1
系列： XE880x
應(yīng)用： 感測機(jī)
核心處理器： Coolrisc816?
程序存儲器類型： 閃存（11 kB）
控制器系列： XE8000
RAM 容量： 512 x 8
接口： UART，USRT
輸入/輸出數(shù)： 24
電源電壓： 2.4 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-TQFP
包裝： 標(biāo)準(zhǔn)包裝
供應(yīng)商設(shè)備封裝： 32-TQFP（7x7）
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱： XE8807AMI026DKR
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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