HAL855UT-K datasheet(37/42 Pages) MICRONAS

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DATA SHEET

HAL855

Micronas

Nov. 26, 2008; DSH000149_003EN

5.3. Telegram Codes

Sync Bit

Each telegram starts with the Sync Bit. This logical “0”

pulse defines the exact timing for tp0.

Command Bits (COM)

The Command code contains 3 bits and is a binary

number. Table 5–2 shows the available commands

and the corresponding codes for the HAL 855.

Command Parity Bit (CP)

This parity bit is “1” if the number of zeros within the 3

Command Bits is odd. The parity bit is “0”, if the num-

ber of zeros is even.

Address Bits (ADR)

The Address code contains 4 bits and is a binary num-

ber. (see Table 5–3 on page 39) shows the available

addresses for the HAL 855 registers.

Address Parity Bit (AP)

This parity bit is “1” if the number of zeros within the 4

Address bits is odd. The parity bit is “0” if the number

of zeroes is even.

Data Bits (DAT)

The 14 Data Bits contain the register information.

The registers use different number formats for the

Data Bits. These formats are explained in Section 5.4.

on page 38

In the Write command, the last bits are valid. If, for

example, the TC register (7 bits) is written, only the

last 7 bits are valid.

In the Read command, the first bits are valid. If, for

example, the TC register (7 bits) is read, only the first 6

bits are valid.

Data Parity Bit (DP)

This parity bit is “1” if the number of zeros within the

binary number is even. The parity bit is “0” if the num-

ber of zeros is odd.

Acknowledge

After each telegram, the output answers with the

Acknowledge signal. This logical “0” pulse defines the

exact timing for tpOUT.

Table 5–2: Available commands

Command

Code

Explanation

READ

read a Setup EEPROM register (like TC, TCSQ, magnetic range, etc.)

READL

read a Characteristics EEPROM register (setpoints 0 to 15)

READH

read a Characteristics EEPROM register (setpoints 16 to 31)

WRITE

write a Setup EEPROM register (like TC, TCSQ, Magnetic range, etc.)

WRITEL

write a Characteristics EEPROM register (setpoints 0 to 15)

WRITEH

write a Characteristics EEPROM register (setpoints 16 to 31)

PROM

program all non-volatile registers

ERASE

erase all non-volatile registers

Please note:

The LOCK bit is set by using the WRITE command followed by a PROM.

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