HAL880 datasheet(29/34 Pages) MICRONAS

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DATA SHEET

HAL880

Micronas

Feb. 23, 2009; DSH000152_001EN

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 HAL 880.

Command Parity Bit (CP)

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

3 Command Bits is uneven. The parity bit is “0”, if the

number of zeros is even.

Address Bits (ADR)

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

ber. Table 5–3 on page 31 shows the available

addresses for the HAL 880 registers.

Address Parity Bit (AP)

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

4 Address bits is uneven. The parity bit is “0”, if the

number of zeros 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 30

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

example, the TC register (10 bits) is written, only the

last 10 bits are valid.

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

example, the TC register (10 bits) is read, only the first

10 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 uneven.

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 register

WRITE

write a register

PROM

program all nonvolatile registers (except the lock bits)

ERASE

erase all nonvolatile registers (except the lock bits)

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