參數(shù)資料
型號: XE8000EV104
廠商: Semtech
文件頁數(shù): 131/156頁
文件大?。?/td> 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
14-3
XE8805/05A
pos.
RegUartTxSta
rw
reset
description
7-2
-
r
000000
Unused
1
UartTxBusy
r
0 resetsystem
Uart busy transmitting
0
UartTxFull
r
0 resetsystem
RegUartTx full
Set by writing to RegUartTx
Cleared when transferring RegUartTx into
internal shift register
Table 14-4: RegUartTxSta
pos.
RegUartRx
rw
reset
description
7-0
UartRx
r
00000000
resetsystem
Received data
Table 14-5: RegUartRx
pos.
RegUartRxSta
rw
Reset
description
7-6
-
r
00
Unused
5
UartRxSErr
r
0 resetsystem
Start error
4
UartRxPErr
r
0 resetsystem
Parity error
3
UartRxFErr
r
0 resetsystem
Frame error
2
UartRxOErr
rc
0 resetsystem
Overrun error
Cleared by writing RegUartRxSta
1
UartRxBusy
r
0 resetsystem
Uart busy receiving
0
UartRxFull
r
0 resetsystem
RegUartRx full
Cleared by reading RegUartRx
Table 14-6: RegUartRxSta
14.4
Interrupts map
interrupt source
default mapping in the interrupt manager
Irq_uart_Tx
IrqHig(1)
Irq_uart_Rx
IrqHig(0)
Table 14-7: Interrupts map
14.5 Uart baud rate selection
In order to have correct baud rates, the Uart interface has to be fed with a stable and trimmed clock source. The
clock source can be the RC oscillator or the crystal oscillator. The precision of the baud rate will depend on the
precision of the selected clock source.
14.5.1
Uart on the RC oscillator
To select the RC oscillator for the Uart, the bit SelXtal in RegUartCmd has to be 0.
In order to obtain a correct baud rate, the RC oscillator frequency has to be set to one of the frequencies given in
the table on the next page. The precision of the obtained baud rate is directly proportional to the frequency
deviation with respect to the values in the table.
Not
Recommended
for
New
Designs
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