HCS361_11 Datasheet, PDF (11/42 Pages) Microchip Technology – KEELOQ® Code Hopping Encoder incorporates high security,

HCS361
3.5.14 IND: INDEPENDENT MODE
The Independent mode can be used where one
encoder is used to control two receivers. Two counters
(SYNC_A and SYNC_B) are used in Independent
mode. As indicated in Table 3-2, function codes 1 to 7
use SYNC_A and 8 to 15 SYNC_B.
3.5.15 INFRARED MODE
The Independent mode also selects IR mode. In IR
mode function codes 12 to 15 will use counter B. The
PWM output signal is modulated with a 40 kHz carrier
(see Table 3-1). It must be pointed out that the 40 kHz
is derived from the internal clock and will therefore vary
with the same percentage as the baud rate. If IND = 0,
SYNC_A is used for all function codes. If IND = 1, Inde-
pendent mode is enabled and counters for functions
are used according to Table 3-2.
TABLE 3-1:
TE
IR MODULATION
Basic Pulse
400us
200us
(400μs)
(16x)
Period = 25μs
(200μs)
(8x)
100us
(100μs)
(4x)
TABLE 3-2: FUNCTION CODES
S3
S2
S1
S0
IND = 0 IND = 1
Comments
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
10
1
0
1
0
11
1
0
1
1
12
1
1
0
0
13
1
1
0
1
14
1
1
1
0
15
1
1
1
1
Note 1: IR mode
Counter
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
A
B
A
B
A
B
A
B⁽¹⁾
A
B⁽¹⁾
A
B⁽¹⁾
A
B⁽¹⁾
If SEED = 1, transmit seed after delay.⁽¹⁾
If SEED = 1, transmit seed immediately.⁽¹⁾
© 2011 Microchip Technology Inc.
DS40146F-page 11