使用PIC18系列器件低延迟驱动程序来访问外部EEPROM

This application note is developed based on low latency
design. It provides an algorithm, which is designed to
use the SPI/I
2
C™ interrupts, to achieve the required
communication and enable optimum processor usage.
The algorithm is developed based on the PIC18 Master
Synchronous Serial Port (MSSP) module with external
Serial Peripheral Interface (SPI) EEPROMs and I
2
C
EEPROMs, respectively. The algorithm uses an
interrupt driven approach.
AN1243
Low Latency Driver to Access External EEPROM Using
PIC18 Family Devices

Authors: Obul Reddy and Ganesh Krishna S.M Disadvantages of Conventional Approach
Microchip Technology Inc. External EEPROM chips, connected via SPI or I2C,
tend to consume a lot of microcontroller throughput to
communicate. The routines accessing the EEPROM
INTRODUCTION will have to wait until the communication is reliably
This application note is developed based on low latency completed. During t