HCS362 datasheet(16/46 Pages) MICROCHIP

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HCS362

DS40189E-page 16

4.5

Configuration Words

There are 36 configuration bits stored in the EEPROM

array. They are used by the device to determine trans-

mission speed, format, delays and Guard times. They

are

grouped

three

Configuration

Words:

CONFIG_0

, CONFIG_1 and the upper nibble of the

SEED_3

word. A description of each of the bits follows

this section.

TABLE 4-2:

CONFIG_0

4.5.1

OSC

The internal oscillator can be tuned to ±10%. (0000

selects the nominal value, 1000 the fastest value and

0111

the slowest). When programming the device, it is

the programmer’s responsibility to determine the opti-

mal calibration value.

4.5.2

VLOW[0..2]

The low voltage threshold can be programmed to be

any of the values shown in the following table:

4.5.3

BSEL[0..1]

The basic timing element TE, determines the actual

transmission Baud Rate. This translates to different

code word lengths depending on the encoding format

selected (Manchester or PWM), the Header length

selection and the Guard time selection, from approxi-

mately 40 ms up to 220 ms. Refer to Table 8-4 and

Table 8-5 for a more complete description.

4.5.4

MTX[0..1]

MTX

selects the minimum number of code words that

will be transmitted. A minimum of 1, 2, 4 or 8 code

words will be transmitted.

Bit

Address

Field

Description

Values

OSC_0

Oscillator adjust

0000

- nominal

1000

- fastest

0111

- slowest

OSC_1

OSC_2

OSC_3

VLOW_0

VLOW select

nominal values

VLOW_1

000

- 2.0V

001

- 2.1V

010

- 2.2V

011

- 2.3V

100

- 4.0V

101

- 4.2V

110

- 4.4V

111

- 4.6V

VLOW_2

BSEL_0

Bitrate select

- TE = 100

μs

- TE = 200

μs

- TE = 400

μs

- TE = 800

μs

BSEL_1

MTX_0

Minimum number of code

words

- 1

- 2

- 4

- 8

MTX_1

GUARD_0

Guard time select

- 0 ms (1 TE)

- 6.4 ms + 2 TE

- 25.6 ms + 2 TE

- 76.8 ms + 2 TE

GUARD_1

TIMOUT_0

Time-out select

- No Time-out

- 0.8 s to 0.8 s + 1 code word

- 3.2 s to 3.2 s + 1 code word

- 25.6 s to 25.6 s + 1 code word

TIMOUT_1

CTSEL

= TIME bits

= CRC bits

Note:

If MTX and BSEL settings in combination

require a transmission sequence to

exceed the TIMOUT setting, TIMOUT will

take priority.

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