HT6P12 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT6P12

Learning Car Alarm Decoder

Holtek Semiconductor 

HT6P12

Power on initial

After power is supplied, the HT6P12 reads in a

value of an option parameter from the

EEPROM to decide the operation type as well

as the output format. If the option table is

empty or the option format is erroneous, the

HT6P12 will automatically load the internal

default value to replace the value of the option

table. The FLASH pin and the LED will also

output a flash signal warning. After the opera-

tion type and the output format are both set, the

decoder will check the customer code in the

EEPROM. If a customer code has been stored,

the HT6P12 will enter the idle state and go to

the arm state immediately. But if none of the

customer codes has been stored in the

EEPROM, the decoder will enter the waiting

state and the external LED will turn on (see the

application circuits) to indicate a waiting state.

Waiting state

The HT6P12 enters the waiting mode after

power is turned on and none of the customer

codes has been saved in the EEPROM. In the

waiting state, the oscillator is activated, and

the HT6P12 is ready for receiving trigger sig-

nals from the LEARN(LED) pin. After the trig-

ger signals have been received from the

LEARN(LED) pin, the decoder will go to the

learning state.

On the other hand, if trigger signals has not

been received from the LEARN(LED) pin, the

decoder will go to the arm state after

AUTO_ARM delay time. But, if the

AUTO_ARM function is disabled (i.e., the

AUTO_ARM delay time is zero, defined in the

option table), the decoder will stay on the wait-

ing state till trigger signals been received from

the LEARN(LED) pin.

Idle state

The HT6P12 enters the idle state after the

EEPROM has stored one or more sets of cus-

tomer codes in it. In the idle state, the HT6P12

is ready for receiving data from its paired en-

coder (HT6P20D) so as to trigger the DIN pin.

Or pressing the LEARN key enters the learning

state. Data in the EEPROM can be erased by

simultaneously pressing the LEARN and

CLEAR keys over 1 seconds (refer to the appli-

cation circuits).

Learning state

The HT6P12 enters the learning state from the

waiting or from the idle state if the

LEARN(LED) pin is active low over 1 seconds.

Then the LED output a flash signal at 1Hz rate

until a set of customer codes has been acquired

within 10 seconds (see the application circuits).

During the 10 seconds, if the DIN pin has re-

ceived proper formatted data and no mistakes

have been made after 5 times continuous check,

the received customer code is stored in the

EEPROM and the LED pin stops flashing also.

After a customer code has been acquired, the

learning state is terminated and the system

goes to the idle state.

In contrast, during the 10 seconds if no

proper formatted data has been entered,

the LED pin will stop flashing and the de-

coder will return to its original state right

after the time is up. The HT6P12 can save

a maximum of 8 sets of customer codes in

the EEPROM. Once the EEPROM has

stored 8 sets of customer codes in it, the

decoder cannot enter the learning state un-

less the customer codes in the EEPROM

are all erased. In the learning state, all the

output pins are held low.

EEPROM erase function

When the LEARN(LED) pin turns low and the

CLEAR(CS) pin turns high over 1 second all

data in the EEPROM are erased. Once the

CLEAR and LEARN keys are released the LED

will automatically turn on.

Remote control mode

In the idle state, if the HT6P12 has received

data from one of its paired encoders

(HT6P20D), it compares the received customer

code with one of the customer codes stored in

the EEPROM three times continuously. If the

received customer code matches one of the local

customer codes in the EEPROM after a three

times continuous check, the last 4 bits of the

8

2nd Oct ’97

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