MAS3549F datasheet(23/92 Pages) MICRONAS

23 / 92 page

DATA SHEET

MAS 35x9F

Micronas

June 30, 2004; 6251-505-1DS

3.2.1. Write Direct Configuration Registers

The write protocol for the direct configuration registers

only consists of device address, subaddress and one

16-bit data word.

3.2.2. Read Direct Configuration Register

To check the PUP1 and PUP2 power-up flags, it is

necessary to read back the content of the direct config-

uration registers.

Fig. 3–1: Example of an I2C bus protocol for the MAS 35x9F (MSB first; data must be stable while clock is high)

Table 3–2: I2C subaddresses

Sub-

address

(hex)

I2C-

Name

Function

Direct Configuration

CONTROL

Controller writes to

MAS 35x9F CONTROL

DCCF

Controller writes to first

DC/DC configuration reg-

ister

DCFR

Controller writes to

second DC/DC configura-

tion register

DSP Core Access

data_write

Controller writes to

MAS 35x9F DSP

data_read

Controller reads from

MAS 35x9F DSP

Codec Access

codec_write

Controller writes to

MAS 35x9F codec regis-

ter

codec_read

Controller reads from

MAS 35x9F codec regis-

ter

SDW

subaddr.

d3,d2

d1,d0

SDW

subaddr.

d3,d2

d1,d0

high byte data

low byte data

Example: I2C write access

SDA

SCL

Example: I2C read access

subaddress

high byte data

low byte data

W = Wait

A = Acknowledge (Ack)

N = Not Acknowledge (NAK)

S = Start

P = Stop

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