Datasheet

GE-O12864C2-TMI/R Page 10/28 07.07.2011
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A0
This is connect to the least significant bit of the normal MPU
address bus, and it determines whether the data bits are data or
a command.
A0 = “H”: Indicates that DB0 to DB7 are display data.
A0 = “L”: Indicates that DB0 to DB7 are control data.
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/RES
/RES is set to “L”, the settings are initialized.
The /RES signal level performs the reset operation.
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/CS1
This is the chip select signal. When /CS1 = “L”, then the chip
select becomes active, and data/command I/O is enabled.