ENA0712 Datasheet, PDF (13/22 Pages) ON Semiconductor – 1/2-Duty Drive General-Purpose LCD Display Driver

LC75832E, 75832W
Control Data Functions
1. P0 to P2: Segment output port/general-purpose output port switching control data
These control data bits switch the segment output port/general-purpose output port functions of the S1/P1 to S4/P4
output pins.
However, segment output port is forcibly selected when in 822 mode data transfer.
Control data
Output pin state
P0
P1
P2
S1/P1
S2/P2
S3/P3
S4/P4
0
0
0
S1
S2
S3
S4
0
0
1
P1
S2
S3
S4
0
1
0
P1
P2
S3
S4
0
1
1
P1
P2
P3
S4
1
0
0
P1
P2
P3
P4
Note: Sn (n = 1 to 4): Segment output ports
Pn (n = 1 to 4): General-purpose output ports
Note that when the general-purpose output port function is selected, the correspondence between the output pins and
the display data will be that shown in the table.
Output pin
Corresponding display data
Static drive mode
1/2 duty drive mode
S1/P1
D1
D1
S2/P2
D2
D3
S3/P3
D3
D5
S4/P4
D4
D7
For example, if the general-purpose output port function is selected for the S4/P4 output pin in 1/2 duty drive mode,
it will output a high level (VLCD) when display data D7 is 1, and a low level (VSS) when D7 is 0.
2. DT: Static drive mode/1/2 duty drive mode switching control data
This control data bit selects either static drive mode or 1/2 duty drive mode.
DT
Duty drive mode
Output pin state (COM2)
0
Static drive mode
1
1/2 duty drive mode
VSS level
COM2
3. FC0 to FC2: Common/segment output waveform frame frequency control data
These control data bits set the frame frequency of the common and segment output waveforms.
However, fo=fosc/384 is forcibly selected when in 822 mode data transfer.
Control data
FC0
FC1
FC2
Frame frequency fo [Hz]
1
1
0
fosc/768, fCK/768
1
1
1
fosc/576, fCK/576
0
0
0
fosc/384, fCK/384
0
0
1
fosc/288, fCK/288
0
1
0
fosc/192, fCK/192
4. OC: RC oscillator operating mode/external clock operating mode switching control data.
This control data bit switches the OSC pin function
(either RC oscillator operating mode or external clock operating mode).
However RC oscillator operating mode is forcibly selected when in 822 mode data transfer.
OC
OSC pin function
0
RC oscillator operating mode
1
External clock operating mode
Note: An external resistor, Rosc, and an external capacitor, Cosc, must be connected to the OSC pin if RC oscillator
operating mode is selected.
No.A0712-13/22