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MB96300 Super Series Hardware Manual
26.1.1
LCD Controller/Driver's divide resistors
The LCD drive voltage is generated either by external voltage divide resistors or internal
voltage divide resistors.
The brightness can be controlled by connecting a variable resister between the V
V3 pins.
When internal divide resistors are used, the corresponding pins can be used as segment
drivers.
■ Selection of internal or external divide resistors
Use the LCD drive power supply control bit (LCR:VSEL)
Controlled operation
To use external divide resistors
(Internal divide resistors disconnected)
To use internal divide resistors
(Internal divide resistors connected)
LCDVER:V[0:3]
LCR:VSEL = 1
LCR:MS[1:0] <> 00
LCD operation enabled
The LCD driving voltage is generated by internal divide resistors. When pins V0..V3 are disabled by setting
the corresponding bit in LCDVER:V[3:0] to zero, additional segment pins become available. Since
LCDVER:V3 = 0, the internal resistor chain is connected to VCC.
LCD drive power supply control bit (VSEL).
Set to "0".
Set to "1".
Figure 26.1-3 Using internal divide resistors:
V[3]=0
V
3
R
V
2
R
V
1
R
V
0
for
B
N-ch
CHAPTER 26 LCD CONTROLLER/DRIVER
VCC
V[3]=0
V3/SEGa
SEGa
V2/SEGb
V[2]=0
SEGb
V[1]=0
V1/SEGc
SEGc
V[0]=0
V0/SEGd
SEGd
LCDER:SEG[a:d]
and
CC
671
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