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参数资料
| 型号： | TRC1315DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 摇控器 |
| 英文描述： | RF, REMOTE CONTROL SUPPORT CIRCUIT, PDSO14 |
| 封装： | PLASTIC, SO-14 |
| 文件页数： | 11/27页 |
| 文件大小： | 358K |
| 代理商： | TRC1315DR |
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TRC1300, TRC1315
MARCSTAR
I E/D
REMOTE CONTROL ENCODER/DECODERS
SLWS011D – AUGUST 1996 – REVISED JANUARY 1997
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
programming — smart decoder (learn mode)
The MARCSTAR I E/D configured as a smart decoder has the capability of learning up to four 40-bit security
codes from four separate encoders. If the decoder attempts to learn a fifth encoder security code, the decoder
logic overwrites the first stored security code with the fifth encoder security code. This FIFO (first in, first out)
operation always causes the
oldest code to be overwritten. When an encoder is lost and a new encoder is
learned by the decoder, all four of the encoders now being used with the decoder should be relearned to ensure
that the decoder contains all the current encoder security codes and no longer stores the security code from
the lost encoder. When there are fewer than four encoders being used with a particular decoder, any of them
can be learned more than once (for a total of four) to fill the remaining decoder security code storage locations
and ensure that the code for the lost encoder has been overwritten.
Each 40-bit security code is loaded into a EEPROM in a single write sequence. An LED connected to the LED
terminal is required to verify a proper write sequence to EEPROM memory. The LED anode should be
connected to positive supply and the cathode to the LED terminal of the MARCSTAR I E/D through a
current-limiting resistor (the LED terminal is active low).
The procedure to write each 40-bit security code into the decoder EEPROM is as follows:
1.
Connect the proper RC combination to the OSCR and OSCC terminals to set the frequency of the
internal oscillator.
2.
Connect the CONF terminal to GND. CONF, which is internally pulled up, must be tied to GND
before the
device is powered up so that when the internal microcontroller reads the CONF terminal during POR
(power on reset), CONF will already be at GND.
3.
Connect the device to system GND and then VCC.
4.
Apply a logic high to PROG (the PROG terminal is internally pulled down and debounced). The device
assumes the program mode and the LED lights. The PROG terminal must be held at logic high for the
duration of the programming sequence.
5.
Apply the MARCSTAR I E/D encoder security code data to be programmed to DIN/DOUT. The first
received frame of data is decoded into a 40-bit security code sequence and loaded into the first memory
bank of the EEPROM. The LED turns off after the device has decoded and stored the received data. The
logic high should now be removed from the PROG terminal. The LED stays on if an attempt is made to
exit the programming mode without learning a code.
6.
To learn up to four encoder security codes, repeat steps 4 and 5. Each time the device is programmed,
the next available memory bank is used, up to four banks.
NOTE: In order to prevent unauthorized programming of the decoder, it is suggested that access to the learn mode be limited to the
manufacturer or dealer. In cases where end-user programming is required, a key-switch can limit programming to authorized
individuals only.
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