Kalle Pihlajasaari replied:

>Tony,

>> I am having trouble initializing my 2x8 optrex
>> lcd w/hd44780a
>> Is it necessary to pull the unused inputs to the
>> lcd low externally ?

>Yes.

No!!
The HD44780 is internally pulled-up. Therefore,
you can leave it open.

Regards,

Peter Tiang
tiangcfoon@hitachi.com.my