UDA1342TS 데이터 시트보기 (PDF) - Philips Electronics

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UDA1342TS

Audio CODEC

Philips Electronics 

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8.16.4 WRITE CYCLE

The write cycle is used to write data from the microcontroller to the internal registers. The I2C-bus format for a write cycle is shown in Table 17.

The device and register addresses are one byte each, data is always two bytes (2-bytes data).

The format of the write cycle is as follows:

1. The microcontroller starts with a START condition S.

2. The first byte (8 bits) contains the device address 0011 01X and a write command (bit R/W = 0).

3. This is followed by an acknowledge (A) from the UDA1342TS.

4. The microcontroller then writes the register address (8 bits) where writing of the register content of the UDA1342TS must start.

5. The UDA1342TS acknowledges this register address.

6. The microcontroller sends 2-bytes data with the Most Significant Data (MSD) byte first and then the Least Significant Data (LSD) byte, where each

byte is acknowledged by the UDA1342TS.

7. After the last acknowledge the UDA1342TS frees the I2C-bus and the microcontroller can generate a STOP condition (P).

Table 17 Master transmitter writes to UDA1342TS registers

DEVICE

ADDRESS

R/W

REGISTER

ADDRESS

S 0011 01X 0 A 0XXX XXXX A

8 bits

8 bits

MSD1

8 bits

ACKNOWLEDGE FROM UDA1342TS

DATA(1)

A LSD1 A MSD2 A LSD2

8 bits

8 bits

8 bits

Note

1. Auto increment of the register address is carried out if repeated groups of 2 bytes are transmitted.

A MSDn A

8 bits

LSDn

8 bits

AP

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