HCS101 datasheet(5/20 Pages) MICROCHIP

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Preliminary

DS41115D-page 5

HCS101

4.0

EEPROM MEMORY

ORGANIZATION

The HCS101 contains 192 bits (12 x 16-bit words) of

EEPROM memory as shown in Table 4-1. Further

descriptions of the memory array are given in the fol-

lowing sections.

TABLE 4-1:

EEPROM MEMORY MAP

4.1

CNTR (Counter)

This is the 16-bit gray code counter value that can be

used to track the number of times a transmitter has

been activated.

4.2

SER_1, SER_2, SER_3 (Encoder

Serial Number)

SER_1, and SER_2 are the 32-bit device serial num-

bers. SER_3 is an additional 10-bit serial number trans-

mitted with every transmission. The most significant 6

bits of the 16-bit SER_3 word are reserved and should

be set to zero.

4.3

Configuration Word

The configuration word is a 16-bit word stored in the

EEPROM array that is used by the device to store the

status configuration options. Further explanations of

each of the bits are described in the following sections.

TABLE 4-2:

CONFIGURATION WORD

4.3.1

OSCILLATOR TUNING BITS

(OSC0 TO OSC3)

These bits are used to tune the nominal frequency of

the HCS101 to within ±10% of its nominal value over

temperature and voltage.

4.3.2

LOW VOLTAGE TRIP POINT

SELECT (VLOWS)

The low voltage trip point select bit (VLOWS) and the S3

setting bit (S3SET) are used to determine the voltage

level for the low voltage detector.

* See also Section 4.3.6

4.3.3

BAUDRATE SELECT BITS (BRS)

BRS selects the speed of transmission and the code

word blanking. Table 4-3 shows how the bit is used to

select the different baud rates and Section 5.2 provides

a detailed explanation of code word blanking.

TABLE 4-3:

BAUDRATE SELECT

WORD

ADDRESS

MNEMONIC

DESCRIPTION

RESERVED

Set to 0000H

RESERVED

Set to 0000H

RESERVED

Set to 0000H

RESERVED

Set to 0000H

CNTR

Counter

RESERVED

Set to 0000H

SER_1

Device Serial Number 1

(word 0) 16 LSb’s

SER_1

Device Serial Number 1

(word 1) 16 MSb’s

SER_2

Device Serial Number 2

(word 0) 16 LSb’s

SER_2

Device Serial Number 2

(word 1) 16 MSb’s

SER_3

Device Serial Number 3

CONFIG

Config Word

Bit Number

Bit Name

0OSC0

1OSC1

2OSC2

3OSC3

4VLOWS

5BRS

6MTX4

TXEN

S3SET

XSER

RESERVED

VLOWS

S3SET*

Trip Point

4.4

6.75

BRS

Basic Pulse

Element

Code Words

Transmitted

400µs

All

200µs

1 out of 2

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