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AT83SND1CXXX-ROTIL Fiches technique(PDF) 152 Page - ATMEL Corporation

No de pièce AT83SND1CXXX-ROTIL
Description  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTIL Fiches technique(HTML) 152 Page - ATMEL Corporation

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4109J–8051–10/06
AT8xC51SND1C
Figure 18-9. Master SPI Polling Flows
18.3.5
Master Mode with Interrupt
Figure 18-10 shows the initialization phase and the transfer phase flows using the interrupt.
Using this flow prevents any overrun error occurrence.
The bit rate is selected according to Table 121.
The transfer format depends on the slave peripheral.
SS may be deasserted between transfers depending also on the slave peripheral.
Reading SPSTA at the beginning of the ISR is mandatory for clearing the SPIF flag. Clear is
effective when reading SPDAT.
SPI Initialization
Polling Policy
Disable interrupt
SPIE = 0
SPI Transfer
Polling Policy
End Of Transfer?
SPIF = 1?
Select Master Mode
MSTR = 1
Select Bit Rate
program SPR2:0
Select Format
program CPOL & CPHA
Enable SPI
SPEN = 1
Select Slave
Pn.x = L
Start Transfer
write data in SPDAT
Last Transfer?
Get Data Received
read SPDAT
Deselect Slave
Pn.x = H



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