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Remote Control Encoder
CODE WORD
PT2260
A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync.
Bit. The 12 AD bits are determined by the corresponding states of A0 ~ A7, A8/D3, A9/D2, D1 and D0
pins at the time of transmission. When the Data Type of PT2260 is used, the address bits will decrease
accordingly.
For example: In the 4-Data Type where the address has eight (8) bits, the transmitting format is:
8 Address Bits
4 Data Bits
Sync. bit
PT2260 has a maximum of ten (10) Address Bits. The following diagram shows the code bits with their
corresponding pins.
A0
A1
A2
A3
A4
A5
A6
A7
A8/D3
A9/D2
D1
A0
SYNC. BIT
One Complete Code Word
2 Data:
4 Data:
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D1 D0 Sync Bit
A0 A1 A2 A3 A4 A5 A6 A7 D3 D2 D1 D0 Sync Bit
The Code Bits A0 ~ A7, A8/D3, A9/D2, D1 and D0 are determined by the states set at these pins. For
example, when the A0 (Pin No.1) is set to “1” (Vcc), the Code Bit A0 is synthesized as “1” bit. In the
same manner, when it (A0 Pin) is set to “0” (Vss) or left floating, the Code Bit A0 is synthesized as a “0”
or “f” bit respectively.
When PT2260 detects “1” on any of the Data pins, it outputs a Code Word at DOUT. If the Data Pin is
still in high state (“1”) the time the Code Word transmission ends, PT2260 outputs the same Code
Word. Please refer to the diagram below:
DATA PIN
DOUT
1 Co d e Wo r d
1 Co d e Wo r d
1 Co d e Wo r d 1 Co d e Wo r d
PT2260 V1.4
-6-
April, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
