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the shifting operation is performed on internal registers that are not accessible in SW (when reading
LCD_AREGA and LCD_AREGB, the data that was original written will also be read back). The SW must
utilize the knowledge about the current state (ASTATE) to calculate what is currently output. ASTATE is
cleared when LCD_AREGA or LCD_AREGB are updated with new values. See Table 29.14 (p. 433)
for an example.
Table 29.14. LCD Animation Example
ASTATE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LCD_AREGA
11000000
01100000
01100000
00110000
00110000
00011000
00011000
00001100
00001100
00000110
00000110
00000011
00000011
10000001
10000001
11000000
LCD_AREGB
11000000
11000000
01100000
01100000
00110000
00110000
00011000
00011000
00001100
00001100
00000110
00000110
00000011
00000011
10000001
10000001
Resulting Data
11000000
11100000
01100000
01110000
00110000
00111000
00011000
00011100
00001100
00001110
00000110
00000111
00000011
10000011
10000001
11000001
In the table, AREGASC = 10, AREGBSC = 10, ALOGSEL = 1 and the resulting data is be displayed on
segment lines 7-0 multiplexed with LCD_COM0.
Figure 29.44. LCD Block Diagram of the Animation Circuit
SEGD0[ 7:0]
AREGASC = 1 = > shift left
AREGASC = 2 = > shift right
Odd anim ation states
AREGA
CLK EVENT
AREGB
Data Out[ 7:0]
AREGBSC = 1 = > shift left
AREGBSC = 2 = > shift right
Even anim ation states
ALOGSEL
2011-04-12 - d0001_Rev1.10
433
www.energymicro.com
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