dsPIC33FJ32MC204 Microchip Technology, dsPIC33FJ32MC204 Datasheet - Page 180

• Manufacturer Part Number: dsPIC33FJ32MC204
• Description: (dsPIC33FJ16MC304 / dsPIC33FJ32MC20x) 16-bit Microcontrollers
• Manufacturer: Microchip Technology

16.5
To set up the SPI module for the Slave mode of operation:
1.
2.
FIGURE 16-1:
DS70283B-page 178
Clear the SPIxBUF register.
If using interrupts:
a)
b)
c)
SDOx
SCKx
SDIx
SSx
SPI Setup: Slave Mode
Clear the SPIxIF bit in the respective IFSn
register.
Set the SPIxIE bit in the respective IECn
register.
Write the SPIxIP bits in the respective IPCn
register to set the interrupt priority.
Read SPIxBUF
Control
Sync
Transfer
SPI MODULE BLOCK DIAGRAM
SPIxRXB
bit 0
SPIxBUF
SPIxSR
Control
Clock
Shift Control
SPIxTXB
Transfer
Write SPIxBUF
Preliminary
Select
Edge
3.
4.
5.
6.
7.
The SPI module generates an interrupt indicating com-
pletion of a byte or word transfer, as well as a separate
interrupt for all SPI error conditions.
16
Write the desired settings to the SPIxCON1 and
SPIxCON2
(SPIxCON1<5>) = 0.
Clear the SMP bit.
If the CKE bit is set, then set the SSEN bit
(SPIxCON1<7>) to enable the SSx pin.
Clear the SPIROV bit (SPIxSTAT<6>).
Enable SPI operation by setting the SPIEN bit
(SPIxSTAT<15>).
Secondary
Prescaler
1:1 to 1:8
Internal Data Bus
registers
1:1/4/16/64
Prescaler
Primary
© 2007 Microchip Technology Inc.
F
SPIxCON1<1:0>
SPIxCON1<4:2>
Enable
Master Clock
with
CY
MSTEN