AT83SND1CXXX-ROTIL datasheet(153/212 Pages) ATMEL

Il numero della parte	AT83SND1CXXX-ROTIL

Spiegazioni elettronici	Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface

PDF	212 Pages

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Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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4109J–8051–10/06

AT8xC51SND1C

Figure 18-10. Master SPI Interrupt Flows

18.3.6

Slave Mode with Polling Policy

Figure 18-11 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

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