HCS360 datasheet(12/40 Pages) MICROCHIP

12 / 40 page

HCS360

DS40152F-page 12

4.0

TRANSMITTED WORD

4.1

Transmission Format (PWM)

The HCS360 code word is made up of several parts

(Figure 4-1 and Figure 4-2). Each code word contains

a 50% duty cycle preamble, a header, 32 bits of

encrypted data and 35 bits of fixed data followed by a

guard period before another code word can begin.

Refer to Table 9-3 and Table 9-5 for code word timing.

4.2

Code Word Organization

The HCS360 transmits a 67-bit code word when a but-

ton is pressed. The 67-bit word is constructed from a

Fixed Code portion and an Encrypted Code portion

(Figure 3-1).

The Encrypted Data is generated from 4 function bits,

2 user bits, overflow bit, Independent mode bit, and 8

serial number bits, and the 16-bit synchronization value

(Figure 3-1). The encrypted portion alone provides up

to four billion changing code combinations.

The Fixed Code Data is made up of a VLOW bit, 2 CRC

bits, 4 function bits, and the 28-bit serial number. If the

extended serial number (32 bits) is selected, the 4 func-

tion code bits will not be transmitted. The fixed and

encrypted sections combined increase the number of

code combinations to 7.38 x 1019

FIGURE 4-1:

CODE WORD FORMAT (PWM)

FIGURE 4-2:

CODE WORD FORMAT (MANCHESTER)

LOGIC "1"

Guard

Time

31XTE

Encrypted Portion

Fixed Portion

LOGIC "0"

Preamble

Header

10xTE

of Transmission

Preamble

50% Duty Cycle

Guard

Preamble

Header

Encrypted Portion

Fixed Portion

1 2

START bit

STOP bit

Time

bit 0

bit 1

bit 2

LOGIC "0"

LOGIC "1"

4XTE

31XTE

of Transmission

Preamble

50% Duty Cycle

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