PIC18F1XK22 Datasheet, PDF (135/388 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F1XK22/LF1XK22
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, dis-
play drivers, A/D converters, etc. The MSSP module
can operate in one of two modes:
• Serial Peripheral Interface (SPI)
• Inter-Integrated Circuit (I²C™)
- Full Master mode
- Slave mode (with general address call)
The I²C interface supports the following modes in
hardware:
• Master mode
• Multi-Master mode
• Slave mode
14.2 SPI Mode
The SPI mode allows 8 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)
Internal
Data Bus
Read
Write
SSPBUF Reg
SDI/SDA
SDO
SSPSR Reg
bit 0
Shift
Clock
SS
SCK/SCL
SS Control
Enable
Edge
Select
2
Clock Select
SSPM<3:0>
4
( ) ^{TMR2 Output}
2
Edge
Select
Prescaler TOSC
4, 16, 64
TRIS bit
 2010 Microchip Technology Inc.
Preliminary
DS41365D-page 135