AT83SND2CMP3B datasheet(162/241 Pages) ATMEL

Part #	AT83SND2CMP3B

Description	Single-Chip Flash Microcontroller with MP3 Decoder with Full Audio Interface

PDF	241 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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162 / 241 page

162

4341F–MP3–03/06

AT8xC51SND2C/MP3B

Figure 19-9.

Master SPI Polling Flows

19.3.5

Master Mode with Interrupt

Figure 19-10 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 19-1.

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

AT83SND2CMP3B Datasheet(PDF) 162 Page - ATMEL Corporation