PIC24FJ256GB108-I Datasheet, PDF (182/352 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit Flash Microcontrollers with USB On-The-Go (OTG)

PIC24FJ256GB110 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 MSTEN
(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 MSTEN
(SPIxCON1<5>) = 0.
4. Clear the SMP bit.
5. If the CKE bit (SPIxCON1<8>) is set, then the
SSEN bit (SPIxCON1<7>) 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 15-1:
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
DS39897C-page 182
 2009 Microchip Technology Inc.