HCS201 Datasheet, PDF(8/28 Page) Microchip Technology

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HCS201 Datasheet, PDF (8/28 Pages) Microchip Technology – KEELOQ Code Hopping Encoder

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HCS201

3.7.3 BAUD RATE SELECT BITS (BRS)

BRS selects the speed of transmission and the code

word blanking. Table 3-5 shows how the bit is used to

select the different baud rates and Section 5.5 provides

detailed explanation in code word blanking.

TABLE 3-5: BAUDRATE SELECT

BRS

Basic Pulse

Element

400 Âµs

200 Âµs

Code Words

Transmitted

All

1 out of 2

3.7.4

MINIMUM FOUR TRANSMISSIONS

(MTX4)

If this bit is cleared, only one code is completed if the

HCS201 is activated. If this bit is set, at least four com-

plete code words are transmitted, even if code word

blanking is enabled.

3.7.5 TRANSMIT PULSE ENABLE (TXEN)

If this bit is cleared, no transmission pulse is transmit-

ted before a transmission. If the bit is set, a START

pulse (1 TE long) is transmitted after button de-bounc-

ing, before the preamble of the first code word.

3.7.6 S3 SETTING (S3SET)

This bit determines the value of S3 in the function code

during a transmission and the high trip point selected

by VLOWS in section 3.6.2. If this bit is cleared, S3 mir-

rors S2 during a transmission. If the S3SET bit is set,

S3 in the function code (Button Status) is always set,

independent of the value of S2.

3.7.7

EXTENDED SERIAL NUMBER

(XSER)

If this bit is set, a long 32-bit Serial Number is transmit-

ted. If this bit is cleared, a standard 28-bit Serial Number

is transmitted followed by 4 bits of the function code

(Button Status).

DS41098C-page 8

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