AT83SND2CMP3B datasheet(163/241 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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163 / 241 page

163

4341F–MP3–03/06

AT8xC51SND2C/MP3B

Figure 19-10.

Master SPI Interrupt Flows

19.3.6

Slave Mode with Polling Policy

Figure 19-11 shows the initialization phase and the transfer phase flows using the polling.

The transfer format depends on the master controller.

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

tion” check).

This provides the fastest effective transmission and is well adapted when communicating at high

speed with other Microcontrollers. However, the process may then be interrupted at any time by

higher priority tasks.

SPI Initialization

Interrupt Policy

Enable interrupt

ESPI =1

SPI Interrupt

Service Routine

Select Master Mode

MSTR = 1

Select Bit Rate

program SPR2:0

Select Format

program CPOL & CPHA

Enable SPI

SPEN = 1

Read Status

Read SPSTA

Start New Transfer

write data in SPDAT

Last Transfer?

Get Data Received

read SPDAT

Disable interrupt

SPIE = 0

Select Slave

Pn.x = L

Start Transfer

write data in SPDAT

Deselect Slave

Pn.x = H

AT83SND2CMP3B Datasheet(PDF) 163 Page - ATMEL Corporation

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