Yes, a resistor is necessary to prevent data collisions between the microcontroller DI/O output and EEPROM DO output. Please note the following 2 points. 1 clock cycle reading the address data at A0 via a Read command Inputting an address data A0=1 causes a collision with the dummy bit output of '0' , resulting in the generation of pass-through current. CS=H timing after a Read command During command input after a Write instruction, while the microcontroller DI/O output is at 'L', the CS input starts up and a Ready output 'H' is output from the DO terminal, resulting in generation of a pass-through current path. At this time since DI=H, SK=H is recognized as the start bit during CS input rise, please make SK=L.
Target Products： BR93Lxx Series BR93Axx Series BR93Hxx Series