HCS362-I Datasheet, PDF (18/38 Pages) Microchip Technology – KEELOQ Code Hopping Encoder

HCS362
TABLE 4-4: SEED_3
Bit
Address
0
1
2
...
9
10
11
12
Field
SEED_48
SEED_49
SEED_50
...
SEED_57
SEED_58
SEED_59
LED
Description
Seed Most Significant word
LED output timing
13
MOD
Modulation Format
14
RFEN
RF Enable/S3 multiplexing
15
HEADER
Header Length
4.5.12 HEADER
When PWM mode is selected the header length (low
time between preamble and data bits start) can be set
to 10 x TE or 3 x TE. The 10 x TE mode is recommended
for compatibility with previous KEELOQ encoder mod-
els. In Manchester mode, the header length is fixed and
set to 4 x TE.
4.5.13 RFEN
RFEN selects whether the RFEN output is enabled or
disabled. If enabled, S3 is only sampled 2 s after the
last button is released and at the start of the first trans-
mission. If disabled S3 functions the same as the other
S inputs.
Values
—
0 = VBOT>VLOW
LED blink 200/800 ms
VBOT<VLOW
LED not blinking
1 = VBOT>VLOW
LED blink 25/500 ms
VBOT<VLOW
LED blink once
0 = PWM
1 = MANCHESTER
0 - Enabled
(S3 only sensed 2 seconds after the last but-
ton is released)
1 - Disabled
(S3 same as other S inputs)
0 = short Header, TH = 3 x TE
1 = standard Header, TH = 10 x TE
DS40189D-page 18
Preliminary
© 2002 Microchip Technology Inc.