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HCS360 Datasheet(PDF) 7 Page - Microchip Technology |
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HCS360 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 28 page 2001 Microchip Technology Inc. DS40152D-page 7 HCS360 3.5.3 SEED: ENABLE SEED TRANSMISSION If SEED = 0, seed transmission is disabled. The inde- pendent counter mode can only be used with seed transmission disabled since SEED_2 is shared with the second synchronization counter. With SEED = 1, seed transmission is enabled. The appropriate button code(s) must be activated to trans- mit the seed information. In this mode, the seed infor- mation (SEED_0, SEED_1, and SEED_2) and the upper 12- or 16-bits of the serial number (SER_1) are transmitted instead of the hop code. Seed transmission is available for function codes (Table 3-7) S[3:0] = 1001 and S[3:0] = 0011(delayed). This takes place regardless of the setting of the IND bit. The two seed transmissions are shown in Figure 3-1. FIGURE 3-1: SEED TRANSMISSION All examples shown with XSER = 1, SEED = 1 When S[3:0] = 1001, delay is not acceptable. CRC+VLOW SER_1 SEED_2 SEED_1 SEED_0 Data transmission direction For S[3:0] = 0x3 before delay: 16-bit Data Word 16-bit Counter Encrypt CRC+VLOW SER_1 SER_0 Encrypted Data For S[3:0] = 0011 after delay (Note 1, Note 2): CRC+VLOW SER_1 SEED_2 SEED_1 SEED_0 Data transmission direction Data transmission direction Note 1: For Seed Transmission, SEED_2 is transmitted instead of SER_0. 2: For Seed Transmission, the setting of DELM has no effect. |
Similar Part No. - HCS360_01 |
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Similar Description - HCS360_01 |
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