HCS360-ISLASHP datasheet(7/28 Pages) MICROCHIP

7 / 28 page

 2001 Microchip Technology Inc.

DS40152D-page 7

HCS360

3.5.3

SEED: ENABLE SEED TRANSMISSION

If SEED = 0, seed transmission is disabled. The inde-

pendent counter mode can only be used with seed

transmission disabled since SEED_2 is shared with the

second synchronization counter.

With SEED = 1, seed transmission is enabled. The

appropriate button code(s) must be activated to trans-

mit the seed information. In this mode, the seed infor-

mation (SEED_0, SEED_1, and SEED_2) and the

upper 12- or 16-bits of the serial number (SER_1) are

transmitted instead of the hop code.

Seed transmission is available for function codes

(Table 3-7) S[3:0] = 1001 and S[3:0] = 0011(delayed).

This takes place regardless of the setting of the IND bit.

The two seed transmissions are shown in Figure 3-1.

FIGURE 3-1:

SEED TRANSMISSION

All examples shown with XSER = 1, SEED = 1

When S[3:0] = 1001, delay is not acceptable.

CRC+VLOW

SER_1

SEED_2

SEED_1

SEED_0

Data transmission direction

For S[3:0] = 0x3 before delay:

16-bit Data Word

16-bit Counter

Encrypt

CRC+VLOW

SER_1

SER_0

Encrypted Data

For S[3:0] = 0011 after delay (Note 1, Note 2):

CRC+VLOW

SER_1

SEED_2

SEED_1

SEED_0

Data transmission direction

Note 1: For Seed Transmission, SEED_2 is transmitted instead of SER_0.

2: For Seed Transmission, the setting of DELM has no effect.

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