HCS473 datasheet(14/68 Pages) MICROCHIP

14 / 68 page

HCS473

DS40035C-page 12

Preliminary

 2002 Microchip Technology Inc.

FIGURE 3-1:

GENERAL CODE WORD FORMAT

FIGURE 3-2:

CODE WORD ORGANIZATION

Preamble

Header

Guard

Time

Data Bits

S0 S3

Synchronization

Counter

Synchronization

Counter

LSb

LOW

1-Bit

Fixed Code Portion (35 Bits)

CRC

2 Bits

LOW

1-Bit

SER 1

Most Sig 16 Bits

SER 0

Least Sig 16 Bits

BUT

4 Bits

DISCRIM

8 Bits

20 Bits

Hopping Code Portion Message (32 Bits)

C1 C0

MSb

67 Data bits

Transmitted LSb first.

Hopping Code:

Fixed Code Portion (37 Bits)

QUE

2 Bits

CRC

2 Bits

BUT

4 Bits

S0 S3

SER 0

Least Sig16 Bits

BUT

4 Bits

Counter

Overflow

2 Bits

DISCRIM

10 Bits

Synchronization

16 Bits

Counter

S0 S3

OVR1

OVR0

Hopping Code Portion Message (32 Bits)

Q1 Q0 C1 C0

MSb

LSb

69 Data bits

Transmitted LSb first.

SER 1

12 MSb’s

Hopping Code:

CRC

2 Bits

LOW

1-Bit

BUT

4 Bits

SDVAL3

12 Most Sig Bits

111

SDVAL2

16 Bits

SDVAL1

16 Bits

SDVAL0

16 Least Sig Bits

C1 C0

LSb

MSb

Shaded 65 bits included in CRC calculation

69 Data bits

Transmitted LSb first.

Fixed Code Portion (9 Bits)

Seed Value (60 Bits)

Seed Code:

20-bit Synchronization Counter (CNTSEL=1)

16-bit Synchronization Counter (CNTSEL=0)

32-bit Serial Number (XSER = 1)

28-bit Serial Number (XSER = 0)

Button Queuing enabled (QUEN=1)

Button Queuing disabled (QUEN=0)

Queuing enabled (QUE = 1)

S0 S3

QUE

2 Bits

Q1 Q0

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