HCS410_01 Datasheet, PDF (20/36 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 Code Word Blanking Enable
IDAMP Intelligent Damping for High Q LC Tank.
SEED/ Enable Seed Transmissions
IFF2
TMPSD/ Temporary Seed Transmissions
IFF2
OSC0:3 Onboard Oscillator Tuning Bits
MTX3 Minimum 3 Code Words Transmitted
VLOW Low Voltage Trip Point Selection
LED Enable LED output
BSL0:1 Baudrate Select
TBSL Transponder Baud Rate
MANCH Manchester Modulation Mode
ACOLI Anti Collision Communication Enable
XPRF Passive Proximity Activation
DINC Delayed Increment Enable
XSER 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/1 IFF Key
Seed Limited*
Always Enabled
IFF2/No Seed/2
IFF Keys
* Seed transmissions are allowed till the sychroniza-
tion counter crosses a XX7F₁₆ boundary. e.g. If the
counter is initialized to 0000₁₆ when the device is
programmed, seed transmissions will be allowed
until the counter wraps from 007F₁₆ to 0080₁₆ giving
the user 127 transmissions before seed transmis-
sions are disabled.
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
Manchester
0
0
1
1
Note:
0
400 µs
1
200 µs
0
100 µs
1
100 µs
*If code word blanking is enabled.
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
DS40158E-page 20
Preliminary
 2001 Microchip Technology Inc.