xe8802 Semtech Corporation, xe8802 Datasheet - Page 92

• Manufacturer Part Number: xe8802
• Description: Data Acquisition Soc With 16+10 Bit Zoomingadc? Embedded Risc Controller And Lcd Driver
• Manufacturer: Semtech Corporation

14.4 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 an external clock source, the RC oscillator or the crystal oscillator. The precision of the baud
rate will depend on the precision of the selected clock source.
14.6 Uart on the RC oscillator or external clock source
To select the external clock or RC oscillator for the Uart, the bit SelXtal in RegUartCmd has to be 0. The choice
between the RC oscillator and the external clock source is made with the bit EnExtClock in RegSysClock.
© Semtech 2006
pos.
pos.
pos.
pos.
7-0
7-2
7-0
7-6
1
0
5
4
3
2
1
0
RegUartRxSta
RegUartTxSta
UartRxBusy
UartTxBusy
UartRxOErr
RegUartRx
UartRxSErr
UartRxPErr
RegUartTx
UartRxFErr
UartRxFull
UartTxFull
UartRx
UartTx
-
-
Irq_uart_Tx
Irq_uart_Rx
interrupt source
r/w
rw
rw
rw
rw
r/c
r
r
r
r
r
r
r
r
r
r
XE8802 Sensing Machine Data Acquisition MCU
0 nresetglobal
0 nresetglobal
0 nresetglobal
0 nresetglobal
0 nresetglobal
0 nresetglobal
0 nresetglobal
0 nresetglobal
nresetglobal
nresetglobal
00000000
IrqHig(1)
IrqHig(0)
00000000
default mapping in the interrupt manager
000000
reset
reset
reset
reset
Table 14-5: RegUartTxSta
Table 14-7: RegUartRxSta
Table 14-8: Interrupts map
00
Table 14-6: RegUartRx
Table 14-4: RegUartTx
14-3
with ZoomingADC™ and LCD driver
Cleared when transferring RegUartTx into
Cleared by writing RegUartRxSta
Cleared by reading RegUartRx
Set by writing to RegUartTx
Uart busy transmitting
internal shift register
Uart busy receiving
Data to be send
RegUartRx full
RegUartTx full
Received data
Overrun error
description
description
description
description
Frame error
Parity error
Start error
Unused
Unused
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