MCS3142_14 datasheet(10/37 Pages) MICROCHIP

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MCS3142

DS40001747A-page 10

 2014 Microchip Technology Inc.

TABLE 3-6:

CLASSIC KEELOQ® TECHNOLOGY ENCODER CONFIGURATION REGISTERS

Byte Address

Bit

Description

Values

0x16

7:6

Seed Option

00 = No seed

01 = Limited and immediate

10 = Permanent and delayed

11 = Permanent and immediate

5:2

Reserved

Leave ‘0000’

1:0

Time Element Clock Prescaler 00 = 1:1

01 = 1:4

10 = 1:16

11 = 1:64

0x17

Reserved

Leave ‘0’

6:5

Blank Alternate Code Word

Configuration

00 = All words transmitted

01 = One in two words transmitted

10 = One in four words transmitted

11 = Reserved; illegal value

4:1

Reserved

—

Line Encoding

0 = PWM

1 = Manchester

TABLE 3-7:

CLASSIC KEELOQ® TECHNOLOGY TRANSMITTER CONFIGURATION REGISTERS

Byte Address

Bit

Description

Values

0x18

7:5

Frequency Deviation

Low three bits of frequency deviation calculation (see

Section 6.4 “Center Frequency and Frequency Devia-

tion”)

4Output Power

0 = 0 dBm

1 = +10 dBm

3:0

Reserved

Reserved, maintain as ‘1100’

0x19

Reserved

Reserved, maintain as ‘0’

Data Encoding

0 = FSK

1 = OOK

5Band

0 = 310-450 MHz

1 = 868-870, 902-928 MHz

4:0

Frequency Deviation

High five bits of frequency deviation calculation

TABLE 3-8:

CLASSIC KEELOQ® TECHNOLOGY MINIMUM AND MAXIMUM CODE WORDS COUNT

CONFIGURATION REGISTERS

Byte Address

Bit

Description

Values

0x1A

7:0

Minimum Code Word Count

Integer value of the minimum number of code words sent

0x1B

7:0

Maximum Code Word Count

Least Significant eight bits of value of the maximum

number of code words sent

0x1C

7:0

Most Significant eight bits of value of the maximum

number of code words sent

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