HCS362 datasheet(17/46 Pages) MICROCHIP

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DS40189E-page 17

HCS362

4.5.5

GUARD

The Guard time between code words can be set to 0

ms, 6.4 ms, 25.6 ms and 76.8 ms. If during a series of

code words, the output changes from Hopping Code to

Seed the Guard time will increase by 3 x TE.

4.5.6

TIMOUT[0..1]

The transmission time-out can be set to 0.8 s, 3.2 s,

25.6 s or no time-out. After the time-out period, the

encoder will stop transmission and enter a low power

Shutdown mode.

TABLE 4-3:

CONFIG_1

4.5.7

DISC[0..9]

The discrimination bits are used to validate the

decrypted code word. The discrimination value is typi-

cally programmed with the 10 Least Significant bits of

the serial number or a fixed value.

4.5.8

OVR[0..1]

The overflow bits are used to extend the possible code

combinations to 192K. If the overflow bits are not going

to be used they can be programmed to zero.

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.

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.

4.5.11

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).

Bit

Address

Field

Description

Values

DISC_0

Discrimination bits

DISC

[9:0]

DISC_1

DISC_2

...

DISC_8

DISC_9

OVR_0

Overflow

OVR

[1:0]

OVR_1

XSER

Extended Serial Number

- Disable

- Enable

SEEDC

Seed Control

= Seed transmission on:

S[3210]

= 0001 (delay 1.6 s)

S[3210]

= 0101 (immediate)

= Seed transmission on:

S[3210]

= 0011 (delay 3.2 s)

S[3210]

= 1001 (immediate)

SEED_0

Seed options

- No Seed

- Limited Seed (Permanent and Delayed)

- Permanent and Delayed Seed

- Permanent Seed only

SEED_1

Note:

Whenever a SEED code word is output,

the 4 function bits (Figure 8-4) will be set to

all ones [1,1,1,1].

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