AN1096 - Microchip

AN1096 Using the C30 Compiler to Interface SPI Serial EEPROMs

The purpose of the program is to show individual features of the SPI protocol and give code samples of the instructions and addressing schemes so that the basic building blocks of a program can be shown. The firmware performs the following operations: • • • • • • Low-Density Byte Write Low-Density Byte Read Low-Density Page Write Low-Density Sequential Read .

Features

are not used in the examples provided. INTRODUCTION The 25XXX series serial EEPROMs from Microchip Technology are SPI compatible and have maximum clock frequencies ranging from 3 MHz to 20 MHz. Many times when designing an application which utilizes a serial EEPROM device, it may be beneficial to use a microcontroller which does not feature a dedicated protocol-specific serial port. This can be due to several possible reasons, including size restrictions or costs. In these instances, it is required of the designer to write software routines capable of generating the proper signals for communi.