參數(shù)資料
型號： XE8000EV104
廠商： Semtech
文件頁數(shù)： 134/156頁
文件大小： 0K
描述： EVAL BOARD FOR XE8805AMI028LF
標(biāo)準(zhǔn)包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： XE88LC05AMI028
所含物品： 完全組裝的評估板
Semtech 2006
www.semtech.com
14-6
XE8805/05A
and an interrupt is generated on Irq_uart_Rx. This indicates that new data is available in RegUartRx. The timing
diagram is shown in Figure 14-2.
The UartRxFull bit is cleared when RegUartRx is read. If the register was not read before the receiver transfers a
new word to it, the bit UartRxOErr (overflow error) is set and the previous contents of the register is lost.
UartRxOErr is cleared by writing any data to RegUartRxSta.
The bit UartRxSErr is set if a start error has been detected. The bit is updated at data transfer to RegUartRx.
The bit UartRxPErr is set if a parity error has been detected, i.e. the received parity bit is not equal to the
calculated parity of the received data. The bit is updated at data transfer to RegUartRx.
The bit UartRxFErr in RegUartRxSta shows that a frame error has been detected. No stop bit has been detected.
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 14-2. Uart reception timing diagram.
14.7
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.
Not
Recommended
for
New
Designs
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