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HCS300 bảng dữ liệu(PDF) 6 Page - Microchip Technology |
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HCS300 bảng dữ liệu(HTML) 6 Page - Microchip Technology |
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6 / 36 page  HCS300 DS21137G-page 6 © 2011 Microchip Technology Inc. 3.0 EEPROM MEMORY ORGANIZATION The HCS300 contains 192 bits (12 x 16-bit words) of EEPROM memory (Table 3-1). This EEPROM array is used to store the encryption key information, synchronization value, etc. Further descriptions of the memory array is given in the following sections. TABLE 3-1: EEPROM MEMORY MAP 3.1 KEY_0 - KEY_3 (64-Bit Crypt Key) The 64-bit crypt key is used to create the encrypted message transmitted to the receiver. This key is calcu- lated and programmed during production using a key generation algorithm. The key generation algorithm may be different from the KEELOQ algorithm. Inputs to the key generation algorithm are typically the transmit- ter’s serial number and the 64-bit manufacturer’s code. While the key generation algorithm supplied from Microchip is the typical method used, a user may elect to create their own method of key generation. This may be done providing that the decoder is programmed with the same means of creating the key for decryption purposes. 3.2 SYNC (Synchronization Counter) This is the 16-bit synchronization value that is used to create the hopping code for transmission. This value will increment after every transmission. 3.3 Reserved Must be initialized to 0000H. 3.4 SER_0, SER_1 (Encoder Serial Number) SER_0 and SER_1 are the lower and upper words of the device serial number, respectively. Although there are 32 bits allocated for the serial number, only the lower order 28 bits are transmitted. The serial number is meant to be unique for every transmitter. 3.5 SEED_0, SEED_1 (Seed Word) The 2-word (32-bit) seed code will be transmitted when all three buttons are pressed at the same time (see Figure 4-2). This allows the system designer to imple- ment the secure learn feature or use this fixed code word as part of a different key generation/tracking pro- cess. 3.5.1 AUTO-SHUTOFF TIMER ENABLE The Most Significant bit of the serial number (Bit 31) is used to turn the Auto-shutoff timer on or off. This timer prevents the transmitter from draining the battery should a button get stuck in the on position for a long period of time. The time period is approximately 25 seconds, after which the device will go to the Time- out mode. When in the Time-out mode, the device will stop transmitting, although since some circuits within the device are still active, the current draw within the Shutoff mode will be higher than Standby mode. If the Most Significant bit in the serial number is a one, then the Auto-shutoff timer is enabled, and a zero in the Most Significant bit will disable the timer. The length of the timer is not selectable. WORD ADDRESS MNEMONIC DESCRIPTION 0 KEY_0 64-bit encryption key (word 0) LSb’s 1 KEY_1 64-bit encryption key (word 1) 2 KEY_2 64-bit encryption key (word 2) 3 KEY_3 64-bit encryption key (word 3) MSb’s 4 SYNC 16-bit synchronization value 5 RESERVED Set to 0000H 6 SER_0 Device Serial Number (word 0) LSb’s 7 SER_1 (Note) Device Serial Number (word 1) MSb’s 8 SEED_0 Seed Value (word 0) 9 SEED_1 Seed Value (word 1) 10 RESERVED Set to 0000H 11 CONFIG Config Word Note: The MSB of the serial number contains a bit used to select the Auto-shutoff timer. |
Số phần tương tự - HCS300_11 |
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Mô tả tương tự - HCS300_11 |
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