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HCS410 数据表(PDF) 20 Page - Microchip Technology |
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HCS410 数据表(HTML) 20 Page - Microchip Technology |
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20 / 46 page  HCS410 DS40158F-page 20 © 2011 Microchip Technology Inc. 3.7 Configuration Data The configuration data is used to select various encoder options. Further explanations of each of the bits are described in the following sections. 3.7.1 CWBE: CODE WORD BLANKING ENABLE BSL: BAUD RATE SELECT Selecting this option allows code blanking as shown in Table 3-3. If this option is not selected, all code words are transmitted. 3.7.2 IDAMP: INTELLIGENT DAMPING If IDAMP is set to ‘1’ intelligent damping is disabled. 3.7.3 SEED, TMPSD: SEED TRANSMISSION * Seed transmissions are allowed till the sychroniza- tion counter crosses a XX7F16 boundary. e.g. If the counter is initialized to 000016 when the device is programmed, seed transmissions will be allowed until the counter wraps from 007F16 to 008016 giving the user 127 transmissions before seed transmis- sions are disabled. 3.7.4 OSC: OSCILLATOR TUNING BITS These bits allow the onboard oscillator to be tuned to within 10% of the nominal oscillator speed over both temperature and voltage. TABLE 3-1: CONFIGURATION OPTIONS SEED Symbol Description CWBE Code Word Blanking Enable IDAMP Intelligent Damping for High Q LC Tank. SEED/ IFF2 Enable Seed Transmissions TMPSD/ IFF2 Temporary Seed Transmissions OSC0:3 Onboard Oscillator Tuning Bits MTX3 Minimum 3 Code Words Transmitted VLOW Low Voltage Trip Point Selection LED Enable LED output BSL0:1 Baudrate Select TBSL Transponder Baud Rate MANCH Manchester Modulation Mode ACOLI Anti Collision Communication Enable XPRF Passive Proximity Activation DINC Delayed Increment Enable XSER Extended Serial Number SEED TMPSD Description 00 No Seed/1 IFF Key 01 Seed Limited* 10 Always Enabled 11 IFF2/No Seed/2 IFF Keys TABLE 3-2: OSCILLATOR TUNING OSC Description 1000 Fastest 1001 1010 • • • 1111 Faster 0000 Nominal 0001 0010 • • • 0110 Slower 0111 Slowest TABLE 3-3: BAUD RATE SELECTION Code Hopping Transmissions (TE) Transponder Communication (TE) BSL 1 BSL 0 PWM Manchester Codes Word Transmitted* TBSL PPM 00 400 μs 800 μs All 0 200 μs 01 200 μs 400 μs1 of 2 — — 10 100 μs 200 μs1 of 2 — — 11 100 μs 200 μs 1 of 4 1 100 μs Note: *If code word blanking is enabled. 40158F.book Page 20 Wednesday, June 1, 2011 10:36 AM |
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