ST6285B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST6285B' PDF : 78 Pages View PDF
ST62T85B/E85B
LCD CONTROLLER-DRIVER (Cont”d)
Address Mapping of the Display Segments
The LCD RAM is located in the ST6285B data
space in two pages of 64 bytes from addresses
00h to 3Fh. The LCD forms a matrix of 48 segment
lines (columns) and 8 backplane lines (rows) or 40
segment lines and 11 or 16 backplane lines ac-
cording to the chosen operating mode. Each bit of
the LCD RAM is mapped to one dot of the LCD
matrix, as described in Figure 31. If a bit is set, the
corresponding LCD dot is switched on; if it is reset,
the dos is switched off.
If 1/8 duty cycle mode is selected (48 x 8 dot ma-
trix), only RAM page 1 is used for display data
storage. In this case page 2 is completely free for
common data storage.
If 1/16 duty cycle mode is selected (40 x 16 dot
matrix), RAM page 1 and 2 are used for display
data storage. In this case addresses 00 to 07 in
both pages are free for common data storage.
If 1/11 duty cycle mode is selected (40 x 11 dot
matrix), RAM pages 1 and 2 are used for display
data storage. In this case addresses 00 to 07 in
both pages and bits 3 to 7 in RAM page 2 are free
for common data storage.
In all display modes 16 bytes from address 38h to
3Fh in RAM pages 1 and 2 are free common data
storage.
After reset, the LCD RAM is not initialized and con-
tains arbitrary information. As the LCD control reg-
ister is reset, the LCD is completely switched off.
Figure 31. Addressing Mapping of the LCD RAM
t(s) 1/11 MUX (48 x 11 = 528 dots
LCD-RAM Address
c COM1
bit0
du COM2
bit1
ro COM3
bit2
P COM4
bit3
COM5
bit4 00 01 - 07 08 - 37 38 - 3E 3F Page 1
te COM6
bit5
le COM7
bit6
o COM8
bit7
Obs COM9
bit0 00 01 - 07 08 - 37 38 - 3E 3F
- COM10 bit1
) COM11 bit2
ct(s COM12 bit3 00 01 - 07 08 - 37 38 - 3E 3F Page 2
u COM13 bit4
rod COM14 bit5
COM15 bit6
5bitx48
free data
storage
P COM16 bit7
te S S
SS
S
le E E
EE
E
GG
GG
G
so 1 2 - 8 9 - 56
b 16 bytes free for
O data storage
16 bytes free for
data storage
57/78
57
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