LC75814V Datasheet, PDF (7/14 Pages) Sanyo Semicon Device – 1/4 Duty General-Purpose LCD Driver

LC75814V
Control Data Functions
1. P0 to P2: Segment output port/general-purpose output port switching control data.
These control data bits switch the S1/P1 to S4/P4 output pins between their segment output port and general-purpose
output port functions.
Control data
P0 P1 P2
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
Output pin states
S1/P1 S2/P2 S3/P3 S4/P4
S1
S2
S3
S4
P1
S2
S3
S4
P1
P2
S3
S4
P1
P2
P3
S4
P1
P2
P3
P4
Note: Sn (n = 1 to 4): Segment output ports
Pn (n = 1 to 4): General-purpose output ports
Also note that when the general-purpose output port function is selected, the output pins and the display data will
have the correspondences listed in the tables below.
Output pin
S1/P1
S2/P2
S3/P3
S4/P4
Corresponding display data
D1
D5
D9
D13
For example, if the output pin S4/P4 has the general-purpose output port function selected, it will output a high level
(V_LCD) when the display data D13 is 1, and will output a low level (V_SS) when D13 is 0.
2. DR: 1/2 bias drive or 1/3 bias drive switching control data
This control data bit selects either 1/2 bias drive or 1/3 bias drive.
DR
Drive type
0
1/3 bias drive
1
1/2 bias drive
3. SC: Segments on/off control data
This control data bit controls the on/off state of the segments.
SC
Display state
0
On
1
Off
However, note that when the segments are turned off by setting SC to 1, the segments are turned off by outputting
segment off waveforms from the segment output pins.
4. BU: Normal mode/power-saving mode control data
This control data bit selects either normal mode or power-saving mode.
BU
Mode
0
Normal mode
Power saving mode (The OSC pin oscillator is stopped, and the common and segment output pins go to the V_SS level. However, the
1
S1/P1 to S4/P4 output pins that are set to be general-purpose output ports by the control data P0 to P2 can be used as general-
purpose output ports.)
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