Microchip Technology MA330020 Data Sheet
2008-2014 Microchip Technology Inc.
DS70000318G-page 219
dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04
16.0
SERIAL PERIPHERAL
INTERFACE (SPI)
INTERFACE (SPI)
The Serial Peripheral Interface (SPI) module is a
synchronous serial interface useful for communicating
with other peripheral or microcontroller devices. These
peripheral devices can be serial EEPROMs, shift
registers, display drivers, Analog-to-Digital Converters
and so on. The SPI module is compatible with SPI and
SIOP from Motorola
synchronous serial interface useful for communicating
with other peripheral or microcontroller devices. These
peripheral devices can be serial EEPROMs, shift
registers, display drivers, Analog-to-Digital Converters
and so on. The SPI module is compatible with SPI and
SIOP from Motorola
®
.
The SPI module consists of a 16-bit shift register,
SPIxSR (where x = 1), used for shifting data in and out,
and a buffer register, SPIxBUF. A control register,
SPIxCON, configures the module. Additionally, a status
register, SPIxSTAT, indicates status conditions.
SPIxSR (where x = 1), used for shifting data in and out,
and a buffer register, SPIxBUF. A control register,
SPIxCON, configures the module. Additionally, a status
register, SPIxSTAT, indicates status conditions.
The serial interface consists of the following four pins:
• SDIx (Serial Data Input)
• SDOx (Serial Data Output)
• SCKx (Shift Clock Input Or Output)
• SSx (Active-Low Slave Select).
In Master mode operation, SCK is a clock output; in
Slave mode, it is a clock input.
Slave mode, it is a clock input.
FIGURE 16-1:
SPIx MODULE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the dsPIC33FJ06GS101/X02 and
dsPIC33FJ16GSX02/X04 families of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to “Serial Peripheral
Interface (SPI)” (DS70206) in the
“dsPIC33F/PIC24H Family Reference
Manual”, which is available on the
Microchip web site (
dsPIC33FJ16GSX02/X04 families of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to “Serial Peripheral
Interface (SPI)” (DS70206) in the
“dsPIC33F/PIC24H Family Reference
Manual”, which is available on the
Microchip web site (
www.microchip.com
).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
and bit information.
Internal Data Bus
SDIx
SDOx
SSx
SCKx
SPIxSR
bit 0
Shift Control
Edge
Select
F
CY
Primary
1:1/4/16/64
Enable
Prescaler
Sync
SPIxBUF
Control
Transfer
Transfer
Write SPIxBUF
Read SPIxBUF
16
SPIxCON1<1:0>
SPIxCON1<4:2>
Master Clock
Clock
Control
Secondary
Prescaler
1:1 to 1:8
SPIxRXB
SPIxTXB