AT89C5132-ROTIL datasheet(125/182 Pages) ATMEL

Nome de Peças	AT89C5132-ROTIL

Descrição Electrónicos	USB Microcontroller with 64K Bytes Flash Memory

PDF	182 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

Logo

125 / 182 page

125

4173E–USB–09/07

AT89C5132

19.3.1

Master Configuration

The SPI operates in master mode when the MSTR bit in SPCON is set.

19.3.2

Slave Configuration

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

loaded in SPDAT.

19.3.3

Data Exchange

There are two possible Policies 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 policy.

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.

•

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

transfer” check).

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

at high speed with other Microcontrollers. However, the procedure may then be interrupted at

any time by higher priority tasks.

AT89C5132-ROTIL Folha de dados(PDF) 125 Page - ATMEL Corporation