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HCS300 Datasheet(PDF) 10 Page - Microchip Technology |
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HCS300 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 28 page  HCS300 DS21137F-page 10 © 2001 Microchip Technology Inc. 5.0 SPECIAL FEATURES 5.1 Code Word Completion The code word completion feature ensures that entire code words are transmitted, even if the button is released before the code word is complete. If the but- ton is held down beyond the time for one code word, multiple code words will result. If another button is acti- vated during a transmission, the active transmission will be aborted and a new transmission will begin using the new button information. 5.2 LED Output Operation During normal transmission the LED output is LOW. If the supply voltage drops below the low voltage trip point, the LED output will be toggled at approximately 5Hz during the transmission (Section 3.6.4). 5.3 RPT: Repeat Indicator This bit will be low for the first transmitted word. If a button is held down for more than one transmitted code word, this bit will be set to indicate a repeated code word and remain set until the button is released. 5.4 VLOW: Voltage LOW Indicator The VLOW signal is transmitted so the receiver can give an indication to the user that the transmitter bat- tery is low. The VLOW bit is included in every transmis- sion (Figure 4-2 and Figure 8-4) and will be transmitted as a zero if the operating voltage is above the low voltage trip point. Refer to Figure 4-2. The trip point is selectable based on the battery voltage being used. See Section 3.6.3 for a description of how the low voltage trip point is configured. 5.5 Auto-shutoff The Auto-shutoff function automatically stops the device from transmitting if a button inadvertently gets pressed for a long period of time. This will prevent the device from draining the battery if a button gets pressed while the transmitter is in a pocket or purse. This function can be enabled or disabled and is selected by setting or clearing the Auto-shutoff bit (see Section 3.5.1). Setting this bit high will enable the func- tion (turn Auto-shutoff function on) and setting the bit low will disable the function. Time-out period is approx- imately 25 seconds. 5.6 Seed Transmission In order to increase the level of security in a system, it is possible for the receiver to implement what is known as a secure learn function. This can be done by utilizing the seed value stored in EEPROM, transmitted only when all four button inputs are pressed at the same time (Table 5-1). Instead of the normal key generation inputs being used to create the crypt key, this seed value is used. TABLE 5-1: PIN ACTIVATION TABLE Function S3 S2 S1 S0 Standby 0 00 0 0 Hopping Code 1 00 0 1 2 00 1 0 - -- - - 13 11 0 1 14 11 1 0 Seed Code 15 11 1 1 |
Similar Part No. - HCS300_01 |
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Similar Description - HCS300_01 |
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