RFHCS362G_11 Datasheet, PDF (23/54 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder with UHF ASK/FSK Transmitter

4.5.9 XSER
If XSER is enabled a 32-bit serial number is transmit-
ted. If XSER is disabled a 28-bit serial number and a
4-bit function code are transmitted.
4.5.10 SEED[0..1]
The seed value which is transmitted on key combina-
tions (0011) and (1001) can be disabled, enabled or
enabled for a limited number of transmissions deter-
mined by the initial counter value.
rfHCS362G/362F
In limited Seed mode, the device will output the seed if
the sync counter (Section 4.2) is from 00hex to 7Fhex.
For a counter higher than 7F, a normal hopping code
will be output.
Note:
Whenever a SEED code word is output,
the 4 function bits (Figure 3-10) will be set
to all ones [1,1,1,1].
4.5.11 SEEDC
SEEDC selects between seed transmission on 0001
and 0101 (SEEDC = 0) and 0011 and 1001 (SEEDC
= 1). The delay before seed transmission is 1.6 s for
(SEEDC = 0) and 3.2 s for (SEEDC = 1).
TABLE 4-5:
Bit
Address
0
1
2
...
9
10
11
12
SEED_3
Field
SEED_48
SEED_49
SEED_50
...
SEED_57
SEED_58
SEED_59
LED
13
MOD
14
RFEN
15
HEADER
Description
Seed Most Significant word —
Values
LED output timing
Modulation Format
RF Enable/S3 multiplexing
PWM Header Length
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
© 2011 Microchip Technology Inc.
DS41189B-page 23