xe8802 Semtech Corporation, xe8802 Datasheet - Page 110

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

16.6 Software hints
16.6.1 Master mode
The following routine must be executed by the CoolRISC in order to run properly the SPI interface in master mode:
1- Write RegSpiControl to enable the SPI interface and to configure the master mode (configured by default) and
communication settings.
2- Write the data to send in the RegSpiDataOut register. The SpiTxEmpty flag toggles low.
3- Write 1 to the SpiTxEmpty bit to load the shift register with the value inside the RegSpiDataOut register and to
start the byte transmission. The SpiTxEmpty flag toggles back high.
4- Write the next data to send to the RegSpiDataOut register. The SpiTxEmpty flag toggles low.
© Semtech 2006
Figure 16-4: Connection of master and slaves in the case of a multi slave configuration
digital output pad 1
digital output pad 2
digital output pad 3
Shift register
Shift register
Baud Rate
Generator
Master
XE8802 Sensing Machine Data Acquisition MCU
MISO
MOSI
SCK
NSS
INITIALIZATION
16-7
with ZoomingADC™ and LCD driver
MISO
MISO
MOSI
MOSI
MISO
MOSI
MISO
MOSI
SCK
SCK
SCK
SCK
NSS
NSS
NSS
Shift register
Shift register
Shift register
Shift register
Slave N
Slave 1
Slave 2
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