PIC16F87 Datasheet, PDF (89/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology

10.0 SYNCHRONOUS SERIAL PORT
(SSP) MODULE
10.1 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 PICmicro^®
Mid-Range MCU Family Reference Manual
(DS33023).
Refer to Application Note AN578, “Use of the SSP
Module in the I ²C™ Multi-Master Environment”
(DS00578).
PIC16F87/88
10.2 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)
RB2/SDO/RX/DT
RB1/SDI/SDA
RB4/SCK/SCL
Additionally, a fourth pin may be used when in a Slave
mode of operation:
• Slave Select (SS)
RB5/SS/TX/CK
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 the SSPSTAT register (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)
 2003 Microchip Technology Inc.
Preliminary
DS30487B-page 87