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AT83SND1CXXX-ROTIL データシート(PDF) 154 Page - ATMEL Corporation

部品番号 AT83SND1CXXX-ROTIL
部品情報  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTIL データシート(HTML) 154 Page - ATMEL Corporation

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4109J–8051–10/06
AT8xC51SND1C
Figure 18-11. Slave SPI Polling Flows
18.3.7
Slave Mode with Interrupt Policy
Figure 18-10 shows the initialization phase and the transfer phase flows using the interrupt.
The transfer format depends on the master controller.
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
Data Received?
SPIF = 1?
Select Slave Mode
MSTR = 0
Select Format
program CPOL & CPHA
Enable SPI
SPEN = 1
Prepare Next Transfer
write data in SPDAT
Get Data Received
read SPDAT
Prepare Transfer
write data in SPDAT



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