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PIC32MX3XX/4XX
17.0
SERIAL PERIPHERAL
INTERFACE (SPI)
The SPI module is a synchronous serial interface use-
ful for communicating with external peripherals and
other microcontroller devices. These peripheral
Note 1: This data sheet summarizes the features
of the PIC32MX3XX/4XX family of
devices. It is not intended to be a compre-
hensive reference source. To comple-
ment the information in this data sheet,
refer to Section 23. “Serial Peripheral
Interface (SPI)” (DS61106) of the
“PIC32MX Family Reference Manual” ,
which is available from the Microchip web
devices may be Serial EEPROMs, shift registers, dis-
play drivers, A/D converters, etc. The PIC32MX SPI
module is compatible with Motorola ? SPI and SIOP
interfaces.
Following are some of the key features of this module:
? Master and Slave Modes Support
? Four Different Clock Formats
? Framed SPI Protocol Support
site (www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be avail-
“Memory Organization” in this data
sheet for device-specific register and bit
information.
FIGURE 17-1:
SPI MODULE BLOCK DIAGRAM
?
?
?
?
?
User Configurable 8-bit, 16-bit and 32-bit Data
Width
Separate SPI Data Registers for Receive and
Transmit
Programmable Interrupt Event on every 8-bit,
16-bit and 32-bit Data Transfer
Operation during CPU Sleep and Idle Mode
Fast Bit Manipulation using CLR, SET and INV
Registers
Internal
Data Bus
SPIxBUF
Read
SPIxRXB
Write
SPIxTXB
Registers share address SPIxBUF
Transmit
Receive
SPIxSR
SDIx
SDOx
bit 0
Shift
Control
SSx/F SYNC
Slave Select
and Frame
Sync Control
Clock
Control
Edge
Select
Baud Rate
Generator
PBCLK
SCKx
Enable Master Clock
Note: Access SPIxTXB and SPIxRXB registers via SPIxBUF register.
? 2010 Microchip Technology Inc.
DS61143G-page 111
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