Microchip Technology AC164139 Data Sheet
PIC24FJ256DA210 FAMILY
DS39969B-page 212
2010 Microchip Technology Inc.
To set up the SPI module for the Standard Master mode
of operation:
1.
of operation:
1.
If using interrupts:
a)
a)
Clear the SPIxIF bit in the respective IFS
register.
register.
b)
Set the SPIxIE bit in the respective IEC
register.
register.
c)
Write the SPIxIP bits in the respective IPC
register to set the interrupt priority.
register to set the interrupt priority.
2.
Write the desired settings to the SPIxCON1
and SPIxCON2 registers with MSTEN
(SPIxCON1<5>) = 1.
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>).
(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.
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.
of operation:
1.
Clear the SPIxBUF register.
2.
If using interrupts:
a) Clear the SPIxIF bit in the respective IFS
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.
register to set the interrupt priority.
3.
Write the desired settings to the SPIxCON1
and SPIxCON2 registers with MSTEN
(SPIxCON1<5>) = 0.
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.
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>).
(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
Primary
1:1/4/16/64
Enable
Prescaler
Sync
Clock
Control
SPIxBUF
Control
Transfer
Transfer
Write SPIxBUF
Read SPIxBUF
16
SPIxCON1<1:0>
SPIxCON1<4:2>
Master Clock
Secondary
Prescaler
1:1 to 1:8
F
CY