HCS320 datasheet(8/38 Pages) MICROCHIP

8 / 38 page

HCS320

DS41097D-page 8

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

400

μsAll

200

μs

1 out of 2

100

μs

1 out of 2

100

μs

1 out of 4

-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

5.0

5.5

Max

Min

Max

Min

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