AT83SND1CXXX-ROTIL datasheet(152/212 Pages) ATMEL

部件名	AT83SND1CXXX-ROTIL

功能描述	Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface

PDF	212 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

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152 / 212 page

152

4109J–8051–10/06

AT8xC51SND1C

Figure 18-9. Master SPI Polling Flows

18.3.5

Master Mode with Interrupt

Figure 18-10 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 121.

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

AT83SND1CXXX-ROTIL 数据表(PDF) 152 Page - ATMEL Corporation

AT83SND1CXXX-ROTIL 数据表(HTML) 152 Page - ATMEL Corporation

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