In embedded circuits when we interface peripherals to the controllers, there shall be pins which are called "Active Low". This meant these pins have to be provided LOW input for the peripheral to read it as an activation input. Take the case of an SPI EEPROM, SPI ADC which requires CS for the chip to be enabled. In some cases, when the chip is powered up, there might be a scenario where the CS pin is already in LOW condition. Int his condition, chip shall not be enabled. The CS in these cases has to be pulled HIGH and then pulled LOW for the chip to be enabled.
]]>
0 Comments