UDA1342 PHILIPS [NXP Semiconductors], UDA1342 Datasheet - Page 20

• Manufacturer Part Number: UDA1342
• Description: Audio CODEC
• Manufacturer: PHILIPS [NXP Semiconductors]

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8.16.5
The read cycle is used to read data from the internal registers of the UDA1342TS to the microcontroller. The I
in Table 18.
The format of the read cycle is as follows:
1. The microcontroller starts with a START condition S.
2. The first byte (8 bits) contains the device address 001 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 where reading of the register content of the UDA1342TS must start.
5. The UDA1342TS acknowledges this register address.
6. Then the microcontroller generates a repeated START (Sr).
7. Again the device address 0011 01X is given, but this time followed by a read command (bit R/W = 1).
8. The UDA1342TS sends the two-byte data with the Most Significant Data (MSD) byte first and then the Least Significant Data (LSD) byte, where
9. The microcontroller stops this cycle by generating a negative acknowledge (NA).
10. The UDA1342TS then frees the I
Table 18 Master transmitter reads from UDA1342TS registers
Note
1. Auto increment of the register address is carried out if repeated groups of 2 bytes are transmitted.
S
each byte is acknowledged by the microcontroller (master).
ADDRESS
0011 01X
DEVICE
R
EAD CYCLE
8 bits
R/W
0
A 0XXX XXXX A Sr
ACKNOWLEDGE FROM UDA1342TS
REGISTER
ADDRESS
8 bits
2
C-bus and the microcontroller can generate a STOP condition (P).
ADDRESS
0011 01X
DEVICE
8 bits
R/W
1
A MSD1 A LSD1 A MSD2 A LSD2 A MSDn A LSDn
8 bits
8 bits
ACKNOWLEDGE FROM MASTER
8 bits
DATA
2
8 bits
C-bus format for a read cycle is shown
(1)
8 bits
8 bits
NA P