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2008-09-02

LEARNING DECODER

EN/DECODER

M320D

一華半導體股份有限公司

MOSDESIGN SEMICONDUCTOR CORP.

FUNCTIONAL DESCRIPTION

The M320D is a lining decoder for remote control system application. It can interface with EEPROM(93LC46)，and store 32 sets

of customer codes at maximum.M320D received waveform from its DIN pin and then decodes it. It contains 20 Address Bit, 4

Data Bit, followed by a Sync Bit.

CODE WORD

The transmission word of the M320EA/M320EB that composes of 20 Address Bit, 4 Data Bit, Sync Bit.

VALID TRANSMISSION

When M320D receives transmission code words, it first checks whether this is a valid transmission. A valid transmission must be a

complete code word, and the address bits must match the address setting in the EEPROM. After two consecutive valid

transmissions, M320D drives data pins (D0~D3) according to the data bits received, and raises VT to high voltage.

The timing is show in the following diagram.

3 WORDS

DIN

VT

LATCHED

(D0 ~ D3)

MOMENTARY

(D0 ~ D3)

3 WORDS

2 WORDS

2 WORDS

4CK

12CK

4CK

12CK

DEFINITE：1CK= 8 OSC CLKS WIDTH

“1”

“0”

Address Code

Key Code

M320EA-2

SYNC

96CK

320CK

A0~A19

D0 D1 D2 D3

64CK

M320EA-1

M320EB

1

1

32CK

Address Code

Key Code

SYNC

128CK

4CK

320CK

A0~A19

D0 D1 D2 D3

64CK