Datasheet

 2009-2016 Microchip Technology Inc. DS40001365F-page 127
PIC18(L)F1XK22
14.0 MASTER SYNCHRONOUS
SERIAL PORT (MSSP)
MODULE
14.1 Master SSP (MSSP) Module
Overview
The Master Synchronous Serial Port (MSSP) module is
a serial interface, useful for communicating with other
peripheral or microcontroller devices. These peripheral
devices may be serial EEPROMs, shift registers,
display drivers, A/D converters, etc. The MSSP module
can operate in one of two modes:
• Serial Peripheral Interface (SPI)
• Inter-Integrated Circuit (I
2
C)
- Full Master mode
- Slave mode (with general address call)
The I
2
C interface supports the following modes in
hardware:
•Master mode
• Multi-Master mode
• Slave mode
14.2 SPI Mode
The SPI mode allows eight bits of data to be
synchronously transmitted and received
simultaneously. All four modes of SPI are supported. To
accomplish communication, typically three pins are
used:
• Serial Data Out – SDO
• Serial Data In – SDI
• Serial Clock – SCK
Additionally, a fourth pin may be used when in a Slave
mode of operation:
• Slave Select – SS
Figure 14-1 shows the block diagram of the MSSP
module when operating in SPI mode.
FIGURE 14-1: MSSP BLOCK DIAGRAM
(SPI MODE)
( )
Read Write
Internal
Data Bus
SSPSR Reg
SSPM<3:0>
bit 0
Shift
Clock
SS
Control
Enable
Edge
Select
Clock Select
TMR2 Output
T
OSC
Prescaler
4, 16, 64
2
Edge
Select
2
4
TRIS bit
SDO
SSPBUF Reg
SDI/SDA
SS
SCK/SCL