Datasheet

GE-O12864C2-TMI/R Page 8/28 07.07.2011
7.Interface Pin Function
Pin No. Symbol Level Description
1 IRS
This terminal selects the resistors for the V5 voltage level
adjustment.
IRS = “H”: Use the internal resistors.
IRS = “L”: Do not use the internal resistors.
The V5 voltage level is regulated by an external resistive
voltage divider attached to the VR terminal. This pin is
enabled only when the master operation mode is selected. It is
fixed to either “H”or
“L” when the slave operation mode is selected.
2
/HPM
This is the power cpntrol terminal for the power supply circuit
for liquid crystal drive.
HPM=”H”:Normal made
HPM=”L”:High power mod
3
P/S
This is the parallel data input/serial data input switch terminal.
P/S = “H”: Parallel data input.
P/S = “L”: Serial data input.
The following applies depending on the PS status:
When P/S = “L”, DB0 to DB5 fixed “H”.
/RD (EP) and /WR (RWP) are fixed to either “H” or “L”.
With serial data input, It is impossible read data from RAM .
4
C86
This is the MPU interface switch terminal.
C86 = “H”: 6800 Series MPU interface.
C86 = “L”: 8080 MPU interface.
5
VR
Output voltage regulator terminal. Provides the voltage
between VDD and V5 through a resistive voltage divider.
These are only enabled when the V5 voltage regulator internal
resistors are not used (IRS = “L”). These cannot be used when
the V5 voltage regulator internal resistors are used (IRS =
“H”).
6
V0
This is a multi-level power supply for the liquid crystal drive.
The voltage Supply applied is determined by the liquid crystal
cell, and is changed through the use of a resistive voltage
divided or through changing the impedance using an op. amp.
Voltage levels are determined based on Vss, and must
maintain the relative magnitudes shown below.
V0 ≧V1 ≧V2 ≧V3 ≧V4 ≧Vss
When the power supply turns ON, the internal power supply
circuits produce the V1 to V4 voltages shown below. The
voltage settings are selected using the LCD bias set command.
7
V1
8
V2
9
V3
10
V4