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PT2262 V3.8

- 5 -

September, 2008

Remote Control Encoder

PT2262

Synchronous (Sync.) Bit Waveform

The Synchronous Bit Waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram

below:

1/8 bit width = 4

α

4 bits width = 128

α

Note: 1 bit = 32

α

CODE WORD

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 ~ A5 and A6/D5 ~ A11/D0 pins at

the time of transmission. When Data Type of PT2262 is used, the address bits will decrease

accordingly.

For example: In the 3 Data Type where the address has nine (9) bits, the transmitting format is:

9 Address Bits

3 Data Bits

Sync. bit

PT2262 / PT2272 has a maximum of twelve (12) Address Bits including the six (6) Address/Data bits.

The following diagram shows the code bits with their corresponding pins.

A0

A1

A2

A3

A4

A5

A6/D5

A7/D4

A8/D3

A9/D2

A10/D1 A11/A0

SYNC. BIT

One Complete Code Word

0 Data: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 Sync Bit

1 Data: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 D0

Sync Bit

2 Data A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D1

D0

Sync.Bit

3 Data A0 A1 A2 A3 A4 A5 A6 A7 A8 D2 D1

D0

Sync.Bit

4 Data A0 A1 A2 A3 A4 A5 A6 A7 D3 D2 D1

D0

Sync.Bit

5 Data A0 A1 A2 A3 A4 A5 A6 D4 D3 D2 D1

D0

Sync.Bit

6 Data A0 A1 A2 A3 A4 A5 D5 D4 D3 D2 D1

D0

Sync.Bit

The Code Bits A0 ~ A5 and A6/D5 ~ A11/D0 are determined by the states of A0 ~ A5 and A6/D5 ~

A11/D0 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.