PT6547 Datasheet, PDF (9/35 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

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LCD Driver IC with Key Input Function
PT6547
GENERAL PURPOSE OUTPUT PORT DATA
PT6547 provides 8 General Purpose Output Port namely P1 to P8. Data is written to the General
Purpose Output Port starting from the least significant bit (b0) of the port using a Write Command.
When power is turned on, the bit 8 to bit 1 (b7 to b0) are given the value of “0”.
MSB
LSB
b7 b6 b5 b4 b3 b2 b1 b0
P1
P2
P3
P4
P5
P6
P7
P8
SEGMENT/KEY SCAN OUTPUT SETTING
The Output State Setting Commands: Segment/Key Scan Output selection setting determine the
number, the b0 to b1 are control which may be used for segment output port or key scan output port.
Please refer to the diagram below.
When power is turned on, the bit 2 to bit 1 (b1 to b0) are given the value of “1”.
MSB
LSB
0 0 0 0 0 0 b1 b0
Segment/Key Scan Output selection control bits:
Control Bit
b1
b0
0
0
0
1
1
1
Output pin State
SG75/KS1 SG76/KS2
KS1
KS2
SG75
KS2
SG75
SG76
Maximum number of input keys
30
25
20
PT6547 V1.2
-9-
January, 2006