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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.

LATCH & MOMENTARY

The D0~D3 and VT pins are all at low level when power is turned on.

Data output type selection

(1) LATCH Type(LM=OPEN)：The data outputs follow the encoder during valid receiving, and are then latched in this state until

the next valid receiving occurs.

(2) MOMENTARY Type (LM=VSS)：The data follow the encoder only during valid receiving.

LEARNING MODE

The M320D can save a maximum of 32 sets of customer codes in the EEPROM, after the EEPROM has stored 32 sets of customer

codes in it , the decoder still receiving more (33

th sets) will overriding 1st set of customer codes in the EEPROM, If any customer

code exist, the learning more ignored.

‧ Operation：

1.

LRN pin is active low over 0.5 seconds, the LED pin output a high level (LED on); the M320D enters the learning mode.

2.

During the 8 seconds, if the DI pin has received proper formatted data no mistakes, the received customer code is stored

in the EEPROM and LED flashing 2 times. After the LED off and quits learning mode and goes to the remote control

mode.

3.

If none of the customer code received within 8 seconds, After the LED off and quits learning mode, it goes to the remote

control mode.

‧ EEPROM erase function：

1.

When LRN pin is active low over 0.5 seconds，the LED pin is active high (LED ON), enters the learning mode.

2.

During the 4 seconds, if continues pressing LRN pin active low 4 times. Enters the clear mode after LED flashing 4 times,

indicate the data in the EEPROM are all erased completely.

3.

The LED off and quits clear mode, it goes to the remote control mode.

‧ Learning Mode and LED indication function table

Action

Operation

LED indication

Enters Learning Mode

Learning Key > 0.5sec

LED on

Learning success

LED flashing 2 times

The data in the EEPROM are all erased.

Enters Learning mode. During the 4 seconds

pressing the LRN key 4 times, after the data in

the EEPROM are all erased.

LED flashing 4 times

End Learning Mode

LED off