AT89C5132_07 Datasheet, PDF(128/182 Page) ATMEL Corporation – USB Microcontroller with 64K Bytes Flash Memory

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AT89C5132_07 Datasheet, PDF (128/182 Pages) ATMEL Corporation – USB Microcontroller with 64K Bytes Flash Memory

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Figure 19-11. Slave SPI Polling Policy Flows

SPI Initialization

Polling Policy

Disable interrupt

SPIE = 0

Select Slave Mode

MSTR = 0

Select Format

Program CPOL & CPHA

Enable SPI

SPEN = 1

Prepare Transfer

write data in SPDAT

SPI Transfer

Polling Policy

Data Received?

SPIF = 1?

Get Data Received

Read SPDAT

Prepare Next Transfer

Write Data in SPDAT

19.3.7

Slave Mode with Interrupt Policy

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

policy.

The transfer format depends on the master controller.

Reading SPSTA at the beginning of the ISR is mandatory for clearing the SPIF flag. Clear is

effective when reading SPDAT.

128 AT89C5132

4173EâUSBâ09/07

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