CM2915 Datasheet, PDF (11/19 Pages) Ceramate Technical – LCD Driver (19x4) with Key Scan (4x8)

CM2915
LCD Driver (19*4) with Key Scan (4*8)
B. The CM2915-2 custom code
In this case，the 28 bits on chip MASK ROM ( ROM2 & ROM3-0，ROM3-1，ROM3-2 and
ROM3-3 ) is available and it is decided by one mask layer。The value of ROM2 is “ 00H “ and the
value of ROM3 is show below “ ROM3 option table “。The A0 - - A2 are set by S0 - - S7 ( “ A0 - - A2
option table “ )。The A3 - - A7 are set by S14 & S15( “ ROM3 option table “ )。The A8 - - A15 equal
some bits be inverted of A0 - - A7 and the inversion are decided by logical OR between the switches
S8 - - S13 and ROM2。
A0 - - A2
S0 = 1
S1 = 1
S2 = 1
S3 = 1
S4 = 1
S5 = 1
S6 = 1
S7 = 1
option table
A0 A1 A2
000
100
010
110
001
101
011
111
S14 S15
00
01
10
11
ROM3 option table
A3 A4 A5 A6 A7
00 0 00
11 0 01
00 0 01
10 1 11
ROM3
ROM3-0
ROM3-1
ROM3-2
ROM3-3
S0 - - S7 are closed must only one.
Note : priority S7 > - - - > S0 ( A0 - - A2 option table )
* All specs and applications shown above subject to change without prior notice.
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Rev 1.0 Aug.1, 2003