AT89C5132-ROTIL datasheet(126/181 Pages) ATMEL

Part #	AT89C5132-ROTIL

Description	USB Microcontroller with 64K Bytes Flash Memory

PDF	181 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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126 / 181 page

126

4173D–USB–02/06

AT89C5132

Figure 19-9. Master SPI Polling Policy Flows

19.3.5

Master Mode with Interrupt Policy

Figure 19-10 shows the initialization phase and the transfer phase flows using the interrupt pol-

icy. Using this flow prevents any overrun error occurrence.

•

The bit rate is selected according to Table 97.

•

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

AT89C5132-ROTIL Datasheet(PDF) 126 Page - ATMEL Corporation

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