HCS360 datasheet(9/28 Pages) MICROCHIP

9 / 28 page

 2001 Microchip Technology Inc.

DS40152D-page 9

HCS360

3.5.6

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 3-7, function codes 1 to 7

use SYNC_A and 8 to 15 SYNC_B. The independent

mode also selects IR mode. In IR mode function codes

12 to 15 will use SYNC_B. The PWM output signal is

modulated with a 40 kHz carrier. It must be pointed out

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, independent mode is enabled and counters

for functions are used according to Table 3-7.

For IND = 1 and S[3:0]

≡ 0xC, 0xD, 0xE, 0xF, Basic

Pulse Width modulation becomes:

3.5.7

USRA,B: USER BITS

User bits form part of the discrimination value. The user

bits together with the IND bit can be used to identify the

counter that is used in independent mode.

3.5.8

XSER: EXTENDED SERIAL NUMBER

If XSER = 1, the full 32-bit serial number [SER_1,

SER_0] is transmitted. If XSER = 0, the four most sig-

nificant bits of the serial number are substituted by

S[3:0] and is compatible with the HCS200/300/301.

3.5.9

TMPSD: TEMPORARY SEED

TRANSMISSION

The temporary seed transmission can be used to dis-

able learning after the transmitter has been used for a

programmable number of operations. This feature can

be used to implement very secure systems. After learn-

ing is disabled, the seed information cannot be

accessed even if physical access to the transmitter is

possible. If TMPSD = 1 the seed transmission will be

disabled after a number of code hopping transmis-

sions. The number of transmissions before seed trans-

mission is disabled, can be programmed by setting the

synchronization counter (SYNC_A, SYNC_B) to a

value as shown in Table .

TABLE 3-6:

SYNCHRONOUS COUNTER

INITIALIZATION VALUES

Synchronous Counter

Values

Number of

Transmissions

0000H

128

0060H

0050H

0048H

TABLE 3-7:

FUNCTION CODES

IND = 0

IND = 1

Comments

Counter

001

010

If SEED = 1, transmit seed after delay.

100

101

110

111

000

If SEED = 1, transmit seed immediately.

010

011

100

B IR mode

101

B IR mode

110

B IR mode

111

B IR mode

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