When reserved pin No55, 57 and 59 are not used, are these pins open pin?
20 K ohm register is connected with Pin No 55 in datasheet P.22.
If No 55 is not used, is this pin left to open ?
Pin 55 needs to be pulled up, as it is shown in the schematic, but pins 57 and 59 should be left open.
Thank you for your answer.Can I ask one more question?Please let me know why reserved pin 55 needs to be pull up with 20K ohm.
Pin 55 is internally connected to a serial/parallel control, and must be pulled high to put the part in parallel mode. The part could work with serial control (that's what the other reserved pins are for), but a decision was made when the part was released to specify it for parallel-only operation.
Thank you for your answer.
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