TRC1300, TRC1315
MARCSTAR
I E/D
REMOTE CONTROL ENCODER/DECODERS
SLWS011D – AUGUST 1996 – REVISED JANUARY 1997
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
encoder mode (continued)
TRC1300 and TRC1315 MARCSTAR I E/D devices are configured as an encoder by holding the CONF terminal
high or by not connecting CONF and allowing the internal pullup to hold it high (a connection to CONF is not
required to select the encoder mode).
In the encoder mode, the device sends a maximum of 360 frames of data out through the DIN/DOUT terminal
when one or any combination of VRC/TX1 – VRC/TX4 terminals is pulled low — when buttons on a remote
transmitter are pressed, for example. The following list and Figure 4 detail the response to various button-press
inputs.
D When a button is pressed, a maximum of 360 frames of data are sent.
D Multiple button presses can occur during the output of the 360 frames.
D If all buttons are released before all 360 frames are sent, output of data ceases at that point and the timeout
counter resets.
D If any buttons are still pressed after all 360 frames have been sent, no additional data is sent and the timeout
counter is not reset.
D The timeout counter resets only when all buttons are released, allowing the device to enter a low-power
standby mode while it waits to detect a button press.
n Frames
Less than
1 Frame
343 DCLKs
360 Frame Max
> 360 Frames
n Frames
Encoder
VRC/TX1-4
Encoder
DOUT
Encoder
LED
Figure 4. Encoder Timing