LC75844M Datasheet, PDF (6/14 Pages) Sanyo Semicon Device – 1/4 Duty General-Purpose LCD Driver

2. When CL is stopped at the high level
CE
CL
DI 0 0 1 0 0 0 1 0 D1 D2 D3
B0 B1 B2 B3 A0 A1 A2 A3
CCB address
8 bits
LC75844M
D37 D38 D39 D40 D41 D42 D43 D44 0 0 0 0 0 P0 P1 P2 DR SC BU 0
Display data
44 bits
Control data
11 bits
DD
1 bit
0010001
B0 B1 B2 B3 A0 A1 A2
CCB address
8 bits
0 D45 D46 D47
A3
D81 D82 D83 D84 D85 D86 D87 D88 0 0 0 0 0 0 0 0 0 0 0 1
Display data
44 bits
Fixed data
11 bits
DD
1 bit
Note: DD ... Direction data
A12601
• CCB address...............44H
• D1 to D88...................Display data
• P0 to P2 ......................Segment output port/general-purpose output port switching control data
• DR ..............................1/2 bias drive or 1/3 bias drive switching control data
• SC...............................Segments on/off control data
• BU ..............................Normal mode/power-saving mode control data
Serial Data Transfer Examples
• When 45 or more segments are used, all 112 bits of the serial data must be sent.
8 bits
56 bits
00100010
B0 B1 B2 B3 A0 A1 A2 A3
D1 D2 D3
D37 D38 D39 D40 D41 D42 D43 D44 0 0 0 0 0 P0 P1 P2 DR SC BU 0
00100010
B0 B1 B2 B3 A0 A1 A2 A3
D45 D46 D47
D81 D82 D83 D84 D85 D86 D87 D88 0 0 0 0 0 0 0 0 0 0 0 1
A12602
• When fewer than 45 segments are used, only 56 bits of serial data need to be sent. However, the display data D1 to D44
and the control data must be sent.
8 bits
56 bits
00100010
B0 B1 B2 B3 A0 A1 A2 A3
D1 D2 D3
D37 D38 D39 D40 D41 D42 D43 D44 0 0 0 0 0 P0 P1 P2 DR SC BU 0
A12603
Note: When fewer than 45 segments are used, transfers such as that shown in the figure below cannot be used.
8 bits
00100010
B0 B1 B2 B3 A0 A1 A2 A3
D45 D46 D47
56 bits
D81 D82 D83 D84 D85 D86 D87 D88 0 0 0 0 0 0 0 0 0 0 0 1
A12604
No. 6235-6/14