ST6285B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST6285B' PDF : 78 Pages View PDF
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
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.
7
0
Table 23. 32KHz Division Factor for Base
MUX16 MUX11 HF2 HF1 HF0 - LF1 LF0
Frequency Selection
LF1 LF0
32KHz Division Factor
Bits 7-6 = MUX16, MUX11. Multiplexing ratio se-
0
0 512
lect bits. These bits select the number of common
backplanes used by the LCD control.
t(s) Bits 5-3 = HF0, HF1, HF2. Oscillator select bits.
These bits allow the LCD controller to be supplied
Obsolete Product(s) - Obsolete Produc with the correct frequency when different high
0
1 386
1
0 256
1
1 192
0
0 128
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