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2005 Microchip Technology Inc.
Preliminary
DS41265A-page 165
PIC16F946
14.0
SSP MODULE OVERVIEW
The Synchronous Serial Port (SSP) module is a serial
interface used to communicate with other peripheral or
microcontroller devices. These peripheral devices may
be serial EEPROMs, shift registers, display 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 information
on the SSP module can be found in the “PICmicro
Mid-Range MCU Family Reference Manual” (DS33023).
Refer to Application Note AN578, “Use of the SSP
Module in the Multi-Master Environment” (DS00578).
14.1
SPI Mode
This section contains register definitions and operational
characteristics of the SPI module. Additional information
on the SPI module can be found in the “PICmicro
Mid-Range MCU Family Reference Manual” (DS33023).
The 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)
– RC4/T1G/SDO/SEG11
Serial Data In (SDI)
– RC7/RX/DT/SDI/SDA/SEG8
Serial Clock (SCK)
– RC6/TX/CK/SCK/SCL/SEG9
Additionally, a fourth pin may be used when in a Slave
mode of operation:
Slave Select (SS)
– RA5/AN4/C2OUT/SS/SEG5
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)
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