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HCS320 Datasheet(PDF) 8 Page - Microchip Technology |
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HCS320 Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 32 page  HCS320 DS41097C-page 8 © 2001 Microchip Technology Inc. of unique values. This can be done by programming OVR0 and OVR1 to 1s at the time of production. The encoder will automatically clear OVR0 the first time that the synchronization value wraps from 0xFFFF to 0x0000 and clear OVR1 the second time the counter wraps. Once cleared, OVR0 and OVR1 cannot be set again, thereby creating a permanent record of the counter overflow. This prevents fast cycling of 64K counter. If the decoder system is programmed to track the overflow bits, then the effective number of unique synchronization values can be extended to 196,608. 3.5.3 BAUD RATE SELECT BITS (BSL0, BSL1) BSL0 and BSL1 select the speed of transmission and the code word blanking. Table 3-3 shows how the bits are used to select the different baud rates and Section 5.6 provides detailed explanation in code word blanking. TABLE 3-3: BAUD RATE SELECT 3.5.4 LOW VOLTAGE TRIP POINT SELECT The low voltage trip point select bit is used to tell the HCS320 what VDD level is being used. This information will be used by the device to determine when to send the voltage low signal to the receiver. When this bit is set to a one, the VDD level is assumed to be operating from a 9.0 volt or 12.0 volt VDD level. If the bit is set low, then the VDD level is assumed to be 6.0 volts. Refer to Figure 3-1 for voltage trip point. FIGURE 3-1: VOLTAGE TRIP POINTS BY CHARACTERIZATION) BSL1 BSL0 Basic Pulse Element Code Words Transmitted 0 0 400 µsAll 0 1 200 µs 1 out of 2 1 0 100 µs 1 out of 2 1 1 100 µs 1 out of 4 -40 20 40 100 8.5 7.5 8.0 7.0 9.0 2.5 3.0 3.5 4.0 VLOW Temp (C) Volts (V) VLOW sel = 1 VLOW sel = 0 4.5 -20 0 60 80 5.0 5.5 Max Min Max Min |
Similar Part No. - HCS320 |
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Similar Description - HCS320 |
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