AT89C5132-ROTIL datasheet(127/181 Pages) ATMEL

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4173D–USB–02/06

AT89C5132

Figure 19-10. Master SPI Interrupt Policy Flows

19.3.6

Slave Mode with Polling Policy

Figure 19-11 shows the initialization phase and the transfer phase flows using the polling policy.

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

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

AT89C5132-ROTIL Datasheet(PDF) 127 Page - ATMEL Corporation

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