PIC24FJ256GA106T-I Datasheet, PDF (164/292 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit General Purpose Flash Microcontrollers with Peripheral Pin Select

PIC24FJ256GA110 FAMILY
To set up the SPI module for the Standard Master mode
of operation:
1. If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
register.
b) Set the SPIxIE bit in the respective IEC
register.
c) Write the SPIxIP bits in the respective IPC
register to set the interrupt priority.
2. Write the desired settings to the SPIxCON1 and
SPIxCON2 registers with the MSTEN bit
(SPIxCON1<5>) = 1.
3. Clear the SPIROV bit (SPIxSTAT<6>).
4. Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
5. Write the data to be transmitted to the SPIxBUF
register. Transmission (and reception) will start
as soon as data is written to the SPIxBUF
register.
To set up the SPI module for the Standard Slave mode
of operation:
1. Clear the SPIxBUF register.
2. If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
register.
b) Set the SPIxIE bit in the respective IEC
register.
c) Write the SPIxIP bits in the respective IPC
register to set the interrupt priority.
3. Write the desired settings to the SPIxCON1
and SPIxCON2 registers with the MSTEN bit
(SPIxCON1<5>) = 0.
4. Clear the SMP bit.
5. If the CKE bit is set, then the SSEN bit
(SPIxCON1<8>) must be set to enable the SSx
pin.
6. Clear the SPIROV bit (SPIxSTAT<6>).
7. Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
FIGURE 14-1:
SPIx MODULE BLOCK DIAGRAM (STANDARD MODE)
SCKx
SSx/FSYNCx
Sync
Control
SDOx
Control
Clock
Select
Edge
Shift Control
SDIx
bit 0
SPIxSR
1:1 to 1:8
1:1/4/16/64
Secondary
Primary
FCY
Prescaler
Prescaler
SPIxCON1<1:0>
SPIxCON1<4:2>
Enable
Master Clock
Transfer
Transfer
SPIxBUF
Read SPIxBUF
Write SPIxBUF
16
Internal Data Bus
DS39905B-page 162
Preliminary
© 2008 Microchip Technology Inc.