AT83SND2CMP3B datasheet(161/241 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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161 / 241 page

161

4341F–MP3–03/06

AT8xC51SND2C/MP3B

19.3.2

Slave Configuration

The SPI operates in slave mode when the MSTR bit in SPCON is cleared and data has been

loaded is SPDAT.

19.3.3

Data Exchange

There are 2 possible methods to exchange data in master and slave modes:

•

polling

•

interrupts

19.3.4

Master Mode with Polling Policy

Figure 19-9 shows the initialization phase and the transfer phase flows using the polling method.

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.

SPIF flag is cleared when reading SPDAT (SPSTA has been read before by the “end of transfer”

check).

This polling method provides the fastest effective transmission and is well adapted when com-

municating at high speed with other microcontrollers. However, the procedure may then be

interrupted at any time by higher priority tasks.

AT83SND2CMP3B Datasheet(PDF) 161 Page - ATMEL Corporation