There are three types of memories in a PIC Microcontroller, The Flash Program Memory, The Data Memory (RAM) and The EEPROM Data Memory. The code that is written by the user to perform a specific task by the MCU is
Wiring the PCF8574AP 8bit Bidirectional IO Expander Driven i2C Communication Bus / SPI
This is the PCF8574AP consists of an 8-bit quasi-bidirectional port and an i2C Serial Bus Interface. The PCF8574AP has a low current consumption and includes latched output with HIGH consumption and include latched output with high current drive capability for