ST6280 STMICROELECTRONICS [STMicroelectronics], ST6280 Datasheet - Page 59

• Manufacturer Part Number: ST6280
• Description: 8-BIT OTP/EPROM MCU WITH LCD DRIVER EEPROM AND A/D CONVERTER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

LCD CONTROLLER-DRIVER (Cont”d)
Address Mapping of the Display Segments
The LCD RAM is located in the ST6280B data
space in two pages of 64 bytes from addresses
00h to 3Fh. The LCD forms a matrix of 56 segment
lines (columns) and 8 backplane lines (rows) or 48
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
corresponding LCD dot is switched on; if it is reset,
the dos is switched off.
If 1/8 duty cycle mode is selected (56 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.
Figure 33. Addressing Mapping of the LCD RAM
1/11 MUX (48 x 11 = 528 dots
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7
00
00
00
G
S
E
1
Figure
16 bytes free for
data storage
01
01
01
G
S
E
2
32. If a bit is set, the
-
-
-
-
07
07
07
G
S
E
8
08
08
08
G
LCD-RAM Address
S
E
9
-
-
-
-
If 1/16 duty cycle mode is selected (48 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 (48 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.
37
37
37
56
S
E
G
38
38
38
16 bytes free for
data storage
-
-
-
3E
3E
3E
3F
3F
3F
ST62T80B/E80B
Page 1
Page 2
5bitx48
free data
storage
1105
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