HCS361-IP datasheet(8/24 Pages) MICROCHIP

8 / 24 page

HCS361

DS40146C-page 8

Preliminary

3.5.6

DELM: DELAY MODE

If DELM = 1, delay transmission is enabled. A delayed

transmission is indicated by inverting the lower nibble of

the discrimination value. The delay mode is primarily for

compatibility

with

KEELOQ

devices.

DELM = 0, delay transmission is disabled (Table 3-3).

TABLE 3-3

TYPICAL DELAY TIMES

3.5.7

TIMO: TIME-OUT

If TIMO = 1, the time-out is enabled. Time-out can be

used to terminate accidental continuous transmissions.

When time-out occurs, the PWM output is set low and

the LED is turned off. Current consumption will be

higher than in standby mode since current will ﬂow

through the activated input resistors. This state can be

exited only after all inputs are taken low. TIMO = 0, will

enable continuous transmission (Table 3-4).

TABLE 3-4

TYPICAL TIME-OUT TIMES

3.5.8

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 counter 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:

TABLE 3-5

IR MODULATION

3.5.9

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.

3.5.10

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.

3.5.11

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 transmissions.

The number of transmissions before seed transmission

is disabled, can be programmed by setting the synchro-

nization counter (SYNC_A or SYNC_B) to a value as

shown in Table 3-6.

TABLE 3-6

SYNCHRONOUS COUNTER

INITIALIZATION VALUES

TXWAK

FAST

Number of

Code Words

before Delay

Mode

Time Before

Delay Mode

(VPWM = 0)

≈ 2.8s

≈ 2.9s

≈ 2.6s

≈ 2.8s

TXWAK FAST

Maximum

Number of

Code Words

Transmitted

Time Before

Time-out

(VPWM = 0)

256

≈ 25.6s

512

≈ 27.2s

256

≈ 23.8s

512

≈ 25.4s

TXWAK

FAST

Basic Pulse

Synchronous Counter

Values

Number of

Transmissions

0000H

128

0060H

0050H

0048H

(400

µs)

(16x)

(200

µs)

(8x)

Period = 25

µs

(100

µs)

(8x)

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