PIC16F72-E Datasheet, PDF (45/136 Pages) Microchip Technology – 28-Pin, 8-Bit CMOS FLASH Microcontoller with A/D Converter

9.0 SYNCHRONOUS SERIAL PORT
(SSP) MODULE
9.1 SSP Module Overview
The Synchronous Serial Port (SSP) module is a serial
interface useful for communicating with other periph-
eral or microcontroller devices. These peripheral
devices may be Serial EEPROMs, shift registers, dis-
play drivers, A/D converters, etc. The SSP module can
operate in one of two modes:
• Serial Peripheral Interface (SPI)
• Inter-Integrated Circuit (I²C)
An overview of I²C operations and additional informa-
tion on the SSP module can be found in the PIC™
Mid-Range MCU Family Reference Manual
(DS33023).
Refer to Application Note AN578, “Use of the SSP
Module in the I ²C Multi-Master Environment.”
PIC16F72
9.2 SPI Mode
This section contains register definitions and
operational characteristics of the SPI module.
SPI mode allows 8 bits of data to be synchronously
transmitted and received simultaneously. To accomplish
communication, typically three pins are used:
• Serial Data Out (SDO)
• Serial Data In (SDI)
• Serial Clock (SCK)
RC5/SDO
RC4/SDI/SDA
RC3/SCK/SCL
Additionally, a fourth pin may be used when in a Slave
mode of operation:
• Slave Select (SS)
RA5/AN4/SS
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits in the SSPCON register (SSPCON<5:0>)
and SSPSTAT<7:6>. These control bits allow the
following to be specified:
• Master mode (SCK is the clock output)
• Slave mode (SCK is the clock input)
• Clock Polarity (IDLE state of SCK)
• Clock edge (output data on rising/falling edge of
SCK)
• Clock Rate (Master mode only)
• Slave Select mode (Slave mode only)
© 2007 Microchip Technology Inc.
DS39597C-page 43