hcs361 Microchip Technology Inc., hcs361 Datasheet - Page 11

• Manufacturer Part Number: hcs361
• Description: Keeloq Code Hopping Encoder
• Manufacturer: Microchip Technology Inc.

3.5.14
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
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 3-2:
Note 1: IR mode
2002 Microchip Technology Inc.
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
IND: INDEPENDENT MODE
INFRARED MODE
S3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
FUNCTION CODES
S2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
S1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
S0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
IND = 0
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
Counter
TABLE 3-1:
IND = 1
B
B
B
B
400us
200us
100us
A
A
A
A
A
A
A
B
B
B
B
(1)
(1)
(1)
(1)
T
E
If SEED = 1, transmit seed immediately.
If SEED = 1, transmit seed after delay.
IR MODULATION
(100 s)
(4x)
(200 s)
(8x)
Period = 25 s
Basic Pulse
Comments
(400 s)
(16x)
HCS361
DS40146E-page 11
(1)
(1)