HCS201

DS41098C-page 20

© 2001 Microchip Technology Inc.

FIGURE 8-3:

CODE WORD FORMAT: PREAMBLE/HEADER PORTION

FIGURE 8-4:

CODE WORD FORMAT: DATA PORTION (XSER=0)

TABLE 8-4:

CODE WORD TRANSMISSION TIMING REQUIREMENTS

Commercial (C):

Tamb = 0

°C to +70°C

Industrial

(I):

Tamb = -40

°C to +85°C

Code Words Transmitted

All

1 out of 2

Symbol

Characteristic

Number

Min.

Typ.

Max.

Min.

Typ.

Max.

Units

Basic pulse element

1

360

400

440

180

200

220

µs

PWM bit pulse width

3

1.08

1.2

1.32

0.54

0.6

0.66

ms

Preamble duration

23

8.64

9.2

10.56

4.32

4.6

5.28

ms

Header duration

10

3.6

4.0

4.4

1.8

2.0

2.2

ms

Hopping code duration

96

34.56

38.4

42.24

17.28

19.2

21.12

ms

Fixed code duration

102

36.72

40.8

44.88

18.36

20.4

22.44

ms

Guard Time

39

14.04

15.6

17.16

7.02

7.8

8.58

ms



Total Transmit Time

271

97.56

108.4

119.24

48.78

54.2

59.62

ms



PWM data rate



925

833

757

1851

1667

1515

bps

Note 1: The timing parameters are not tested but derived from the oscillator clock.

50% Duty Cycle Preamble

Header

P1

P12

Data Bits

Bit 0

Bit 1

Bit 0

Bit 1

Header

Bit 30 Bit 31 Bit 32 Bit 33 Bit 58 Bit 59

Fixed Portion

Encrypted Portion

Guard

LSB

LSB

MSB

MSB

S3

S0

S1

S2

Time

Serial Number

Button Code

Status

Bit 60 Bit 61 Bit 62 Bit 63 Bit 64 Bit 65