LC75879PT_13 Datasheet, PDF (18/35 Pages) ON Semiconductor – LCD Display Driver

LC75879PT
Control Data Functions
(1) PS10 and PS11, PS2 to PS4 … General-purpose output port (P1 to P4) function setting control data
These control data bits set the general-purpose output function (High or low level output), clock output function or
PWM output function of the P1 output pin, and the general-purpose output function (High or low level output) or
PWM output function of the P2 to P4 output pins.
However, be careful of being unable to set a PWM output function when the external clock operating frequency is
set the fCK2=38[kHz] typ (EXF="1") in external clock operating mode (OC= "1").
In addition, be careful of setting of the general-purpose output function (High or low level output) in the case of the
simple mode transfer forcibly.
PS10
PS11
General-purpose output port (P1) function
0
0
General-purpose output function (High or low level output )
1
0
Clock output function (Clock frequency : fosc/2, fCK/2 )
0
1
Clock output function (Clock frequency : fosc/8, fCK/8 )
1
1
PWM output function (Support for PWM data W10 to W15)
PS2
General-purpose output port (P2) function
0
General-purpose output function (High or low level output )
1
PWM output function (Support for PWM data W20 to W25)
PS3
General-purpose output port (P3) function
0
General-purpose output function (High or low level output )
1
PWM output function (Support for PWM data W30 to W35)
PS4
General-purpose output port (P4) function
0
General-purpose output function (High or low level output )
1
PWM output function (Support for PWM data W10 to W15)
(2) EXF … External clock operating frequency setting control data
This control data bit sets the operating frequency of the external clock which input into the OSCI pin, when the
external clock operating mode (OC="1") is set. However, be careful of setting the fCK1=300[kHz]typ when the
external clock operating mode (OC="1") is set in the case of the simple mode transfer forcibly. In addition, this data
is effective only when external clock operating mode (OC= "1") is set.
EXF
External clock operating frequency fCK[kHz]
0
fCK1=300[kHz] typ
1
fCK2=38[kHz] typ
(3) DN … S68 pin and S69/OSCI pin state setting control data
This control data bit sets state of the S68 pin and the S69/OSCI pin.
Number of display segments
DN
1/4 duty
1/3 duty
Pin state
S68
S69/OSCI
0
Up to 264 segments
Up to 201 segment
“L”(VSS)
1
Up to 272 segments
Up to 207 segment
S68
Note: "L" (VSS)
S68
: Low (VSS) level output
: Segment output
"L" (VSS)/OSCI : Low (VSS) level output in internal oscillator operating mode (OC=0)
External clock input in external clock operating mode (OC=1)
S69/OSCI
: Segment output in internal oscillator operating mode (OC=0)
External clock input in external clock operating mode (OC=1)
“L”(VSS)/OSCI
S69/OSCI
No.A1687-18/35