PIC18F67J11T-I Datasheet, PDF (237/466 Pages) Microchip Technology – 64/80-Pin, High-Performance, 1-Mbit Flash Microcontrollers

PIC18F87J11 FAMILY
20.0 MASTER SYNCHRONOUS
SERIAL PORT (MSSP)
MODULE
20.1 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 (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 with 5-bit and 7-bit address masking
(with address masking for both 10-bit and 7-bit
addressing)
All members of the PIC18F87J11 family have two
MSSP modules, designated as MSSP1 and MSSP2.
Each module operates independently of the other.
Note:
Throughout this section, generic refer-
ences to an MSSP module in any of its
operating modes may be interpreted as
being equally applicable to MSSP1 or
MSSP2. Register names and module I/O
signals use the generic designator ‘x’ to
indicate the use of a numeral to distinguish
a particular module when required. Control
bit names are not individuated.
20.2 Control Registers
Each MSSP module has three associated control regis-
ters. These include a status register (SSPxSTAT) and
two control registers (SSPxCON1 and SSPxCON2). The
use of these registers and their individual configuration
bits differ significantly depending on whether the MSSP
module is operated in SPI or I²C mode.
Additional details are provided under the individual
sections.
Note:
In devices with more than one MSSP
module, it is very important to pay close
attention to SSPxCON register names.
SSP1CON1 and SSP1CON2 control
different operational aspects of the same
module, while SSP1CON1 and
SSP2CON1 control the same features for
two different modules.
20.3 SPI Mode
Note:
Disabling the MSSPx module by clearing
the SSPEN (SSPxCON1<5>) bit may not
reset the module. It is recommended to
clear the SSPxSTAT, SSPxCON1 and
SSPxCON2 registers, and select the
mode prior to setting the SSPEN bit to
enable the MSSPx module.
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 (SDOx) – RC5/SDO1 or
RD4/PMD4/SDO2
• Serial Data In (SDIx) – RC4/SDI1/SDA1 or
RD5/PMD5/SDI2/SDA2
• Serial Clock (SCKx) – RC3/SCK1/SCL1 or
RD6/PMD6/SCK2/SCL2
Additionally, a fourth pin may be used when in a Slave
mode of operation:
• Slave Select (SSx) – RF7/SS1 or RD7/PMD7/SS2
Figure 20-1 shows the block diagram of the MSSPx
module when operating in SPI mode.
 2007-2012 Microchip Technology Inc.
DS39778E-page 237