If the impedance change of the PCB design only occurs once, for example, the line width changes from 8mil to 6mil and then remains at 6mil, the impedance change must be less than 10% to achieve the no
P89C51RB2/RC2/RD2 has 16K32K64K parallel programmable non-volatile FLASH program memory, and can realize serial in-system programming and in-application programming of the device. In-system programmin