64GA106 datasheet(176/330 Pages) MICROCHIP

176 / 330 page

PIC24FJ256GA110 FAMILY

DS39905E-page 176

 2010 Microchip Technology Inc.

To set up the SPI module for the Standard Master mode

of operation:

If using interrupts:

Clear the SPIxIF bit in the respective IFSx

Set the SPIxIE bit in the respective IECx

Write the SPIxIP bits in the respective IPCx

Write the desired settings to the SPIxCON1 and

SPIxCON2 registers with the MSTEN bit

(SPIxCON1<5>) = 1.

Clear the SPIROV bit (SPIxSTAT<6>).

Enable SPI operation by setting the SPIEN bit

(SPIxSTAT<15>).

Write the data to be transmitted to the SPIxBUF

as soon as data is written to the SPIxBUF

To set up the SPI module for the Standard Slave mode

of operation:

Clear the SPIxBUF register.

If using interrupts:

a) Clear the SPIxIF bit in the respective IFSx

b) Set the SPIxIE bit in the respective IECx

Write the SPIxIP bits in the respective IPCx

Write the desired settings to the SPIxCON1

and SPIxCON2 registers with the MSTEN bit

(SPIxCON1<5>) = 0.

Clear the SMP bit.

If the CKE bit is set, then the SSEN bit

(SPIxCON1<8>) must be set to enable the SSx

pin.

Clear the SPIROV bit (SPIxSTAT<6>).

Enable SPI operation by setting the SPIEN bit

(SPIxSTAT<15>).

FIGURE 15-1:

SPIx MODULE BLOCK DIAGRAM (STANDARD MODE)

Internal Data Bus

SDIx

SDOx

SSx/FSYNCx

SCKx

SPIxSR

bit 0

Shift Control

Edge

Select

FCY

Primary

1:1/4/16/64

Enable

Prescaler

Sync

Clock

Control

SPIxBUF

Control

Transfer

Write SPIxBUF

Read SPIxBUF

SPIxCON1<1:0>

SPIxCON1<4:2>

Master Clock

Secondary

Prescaler

1:1 to 1:8

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