Datasheet

 2009-2013 Microchip Technology Inc. DS60001156H-page 211
PIC32MX5XX/6XX/7XX
17.0 SERIAL PERIPHERAL
INTERFACE (SPI)
The SPI module is a synchronous serial interface that
is useful for communicating with external peripherals
and other microcontroller devices. These peripheral
devices may be Serial EEPROMs, Shift registers, dis-
play drivers, Analog-to-Digital Converters, etc. The
PIC32 SPI module is compatible with Motorola
®
SPI
and SIOP interfaces.
Some of the key features of this module include:
• Master mode and Slave mode support
• Four different clock formats
• Enhanced Framed SPI protocol support
• User-configurable 8-bit, 16-bit and 32-bit data
width
• Separate SPI FIFO buffers for receive and transmit
- FIFO buffers act as 4/8/16-level deep FIFOs
based on 32/16/8-bit data width
• Programmable interrupt event on every 8-bit,
16-bit and 32-bit data transfer
• Operation during Sleep and Idle modes
• Fast bit manipulation using CLR, SET and INV
registers
FIGURE 17-1: SPI MODULE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the PIC32MX5XX/6XX/7XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 23. “Serial
Peripheral Interface (SPI)”
(DS60001106) in the “PIC32 Family
Reference Manual”, which is available
from the Microchip web site
(www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
Internal
Data Bus
SDIx
SDOx
SSx
/FSYNC
SCKx
SPIxSR
bit 0
Shift
Control
Edge
Select
Enable Master Clock
Baud Rate
Slave Select
Sync Control
Clock
Control
Transmit
Receive
and Frame
Note: Access SPIxTXB and SPIxRXB FIFOs via SPIxBUF register.
FIFOs Share Address SPIxBUF
SPIxBUF
Generator
PBCLK
WriteRead
SPIxTXB FIFO
SPIxRXB FIFO