ST62T85B datasheet(59/78 Pages) STMICROELECTRONICS

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ST62T85B/E85B

LCD CONTROLLER-DRIVER (Cont”d)

4.7.3 Stand by or STOP operation mode

No clock from the main oscillator is available in

STOP mode for the LCD controller, and the con-

troller is switched off when the STOP instruction is

executed. All segment and common lines are then

switched to ground to avoid any DC biasing of the

LCD elements.

4.7.4 LCD Mode Control Register (LCDCR)

Address: DCh - Read/Write

Bits 7-6 = MUX16, MUX11.

Multiplexing ratio se-

lect bits. These bits select the number of common

backplanes used by the LCD control.

Bits 5-3 = HF0, HF1, HF2.

Oscillator select bits.

These bits allow the LCD controller to be supplied

with the correct frequency when different high

main oscillator frequencies are selected as system

clock. Table 20 shows the set-up for different clock

crystals.

Bits 2 = Reserved.

Bits 1-0 = LF0, LF1.

Base frame frequency select

bits. These bits control the LCD base operational

frequency of the LCD common lines.

LF0, LF1 define the 32KHz division factor as

shown in Table 23.

Table 23. 32KHz Division Factor for Base

Frequency Selection

MUX16

MUX11

HF2

HF1

HF0

LF1

LF0

LF1

LF0

32KHz Division Factor

512

386

256

192

128

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