HCS410 Datasheet, PDF (21/36 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER AND TRANSPONDER

HCS410
3.7 Configuration Data
The configuration data is used to select various
encoder options. Further explanations of each of the
bits are described in the following sections.
TABLE 3-1: CONFIGURATION OPTIONS
SEED
Symbol
Description
CWBE
IDAMP
SEED/
IFF2
TMPSD/
IFF2
OSC0:3
Code Word Blanking Enable
Intelligent Damping for High Q LC Tank.
Enable Seed Transmissions
Temporary Seed Transmissions
Onboard Oscillator Tuning Bits
MTX3
VLOW
LED
BSL0:1
TBSL
MANCH
ACOLI
XPRF
DINC
XSER
Minimum 3 Code Words Transmitted
Low Voltage Trip Point Selection
Enable LED output
Baudrate Select
Transponder Baud Page
Manchester Modulation Mode
Anti Collision Communication Enable
Passive Proximity Activation
Delayed Increment Enable
Extended Serial Number
3.7.1 CWBE: CODE WORD BLANKING ENABLE
BSL: BAUD RATE SELECT
Selecting this option allows code blanking as shown in
Table 3-3. If this option is not selected, all code words
are transmitted.
3.7.2 IDAMP: INTELLIGENT DAMPING
If IDAMP is set to ‘1’ intelligent damping is disabled.
3.7.3 SEED, TMPSD: SEED TRANSMISSION
SEED
0
0
1
1
TMPSD
0
1
0
1
Description
No Seed
Seed Limited
Always Enabled
IFF2/No Seed
3.7.4 OSC: OSCILLATOR TUNING BITS
These bits allow the onboard oscillator to be tuned to
within 10% of the nominal oscillator speed over both
temperature and voltage.
TABLE 3-2: OSCILLATOR TUNING
OSC
Description
1000
1001
1010
•
•
•
1111
0000
0001
0010
•
•
•
0110
0111
Fastest
Faster
Nominal
Slower
Slowest
TABLE 3-3: BAUD RATE SELECTION
Code Hopping Transmissions (TE)
Transponder Communication (TE)
BSL 1
BSL 0
PWM
0
0
400 µs
0
1
200 µs
1
0
100 µs
1
1
100 µs
*If code word blanking is enabled.
Manchester
800 µs
400 µs
200 µs
200 µs
Codes Word
Transmitted*
All
1 of 2
1 of 2
1 of 4
TBSL
0
—
—
1
PPM
200 µs
—
—
100 µs
© 1997 Microchip Technology Inc.
Preliminary
DS40158C-page 21