68HC05CL48 datasheet(104/145 Pages) MOTOROLA

104 / 145 page

GENERAL RELEASE SPECIFICATION

June 11, 1997

MOTOROLA

LCD DRIVER

MC68HC05CL48

12-8

REV 2.0

12.4

LCD CONTROL REGISTER (LCDCR)

DISON - BIT 0

1 =

The Display is on when this bit is ’1’ and

0 =

off when this bit is ’0’. Setting this bit to ’0’ also disconnects the

voltage generator resistor chain from VSS, thus reducing power.

BIAS5 - Bits 2

1 =

Select 5:1 bias voltage levels.

0 =

Select 4:1 bias voltage levels.

MX8 - bit 3

1 =

the system operates with 53 frontplanes and 8 backplanes,

0 =

the system operates with 45 frontplanes and 16 backplanes.

CC0 - CC3 - bits 4,5,6,7

These bits can be used to select the values of the contrast control resistors.

1 =

the corresponding resistor will be shorted. On reset these bits are

set to 1.

Table 12-3. LCD Voltage Characteristic

VLCD=5.0volts

4:1 bias Voltage (volts)

Typical Values

5:1 bias Voltage (volts)]

Typical Values

5.0

3.75

4.0

2.5

3.0

2.5

2.0

1.25

1.0

0.0

76543210

LCDCR

$0007

READ

CC3

CC2

CC1

CC0

MX8

BIAS5

DISON

WRITE

RESET

111100

U = UNAFFECTED

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