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HCS370 Datasheet(PDF) 6 Page - Microchip Technology |
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HCS370 Datasheet(HTML) 6 Page - Microchip Technology |
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6 / 36 page  HCS370 DS41111D-page 6 Preliminary 2002 Microchip Technology Inc. If the device is in the transmit process and detects that a new button is pressed, the current code word will be aborted, a new code word will be transmitted and the time-out counter will RESET. If all the buttons are released, a minimum number of code words will still be completed. The minimum code words can be set to 1, 2, 4, or 8 using the Minimum Code Words (MTX) con- figuration option. If the time for transmitting the mini- mum code words is longer than the time-out time, the device will not complete the minimum code words. The HCS370 has an onboard nonvolatile EEPROM. This EEPROM is used to store user programmable data and the synchronization counter. The data is pro- grammed at the time of production and includes the security related information such as encoder keys, serial numbers, discrimination values, and seed val- ues. All the security related options are read protected. The initial counter value is also programmed at the time of production. From then on the device maintains the counter itself. The HCS370 has built in redundancy for counter protection and can recover from counter cor- ruption. The counter will not increment if the previous write was corrupted by low voltage RESET or power failure dur- ing TPLL. Instead, the counter will revert back to the previous count and the HCS370 will attempt to correct the bad bits. This will continue on every button press until the voltage increases and the counter is success- fully corrected. FIGURE 2-2: I/O CIRCUITS FIGURE 2-3: I/O CIRCUITS ( CONTINUED) DATA, RFEN N P Figure 2-2(D) STEP Outputs VIN Figure 2-2(E) + - 1.2V VDD S0, S1, S2 Inputs S3, S4, SHIFT ZIN Figure 2-3(A) LED Output LED Figure 2-3(C) VDD LED Weak S5/SLEEP ZIN VDD S5 P N SOEN Figure 2-3(B) N P N SLEEP |
Similar Part No. - HCS370 |
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Similar Description - HCS370 |
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