2000 Jul 31 16
NXP Semiconductors Product specification
Audio CODEC UDA1342TS
8.15.4 DATA WRITE MODE
The data write format is given in Table 13 and illustrated
in Fig.9.
When writing data to a device four bytes must be sent:
1. One byte with the device address, being ‘01X0 1000’
where ‘X’ stands for the IPSEL value, including ‘01’ for
signalling write to the device.
2. One byte starting with a logic 0 for signalling write
followed by 7 bits indicating the register address.
3. One byte which is the Most Significant Data (MSD)
byte 1.
4. One byte which is the Least Significant Data (LSD)
byte 2.
8.15.5 D
ATA READ MODE
The data write format is given in Table 14 and illustrated
in Fig.10.
When reading from the device, a prepare read must first be
done. After the prepare read, the device address is sent
again. The device then returns with the register address,
indicating whether the address was valid or not, and the
data of the register.
The data read mode is explained below:
1. One byte with the device address, being ‘01X0 1000’
where ‘X’ stands for the IPSEL value, including ‘01’ for
signalling write to the device.
2. One byte is sent with the register address which needs
to be read. This byte starts with a logic 1, which
indicates that there will be a read action from the
register.
3. One byte with the device address including ‘11’ is sent
to the device. The ‘11’ indicates that the device must
write data to the microcontroller.
4. The device now writes the requested register address
on the L3-bus, indicating whether the requested
register was valid (logic 0) or invalid (logic 1).
5. The device writes data from the requested register to
the L3-bus with the MSD byte 1 first, followed by the
LSD byte 2.
Table 13 L3-bus format for data write
Table 14 L3-bus format for prepare read and read data
L3MODE DATA TYPE
FIRST IN TIME LAST IN TIME
BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7
Address device address 01IPSEL01000
Data transfer 1 register address 0 A6 A5 A4 A3 A2 A1 A0
Data transfer 2 MSD byte 1 D15 D14 D13 D12 D11 D10 D9 D8
Data transfer3LSD byte2 D7D6D5D4D3D2D1D0
L3MODE DATA TYPE
FIRST IN TIME LAST IN TIME
BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6 BIT7
Prepare read
Address device address 01IPSEL01000
Data transfer 1 register address 1 A6 A5 A4 A3 A2 A1 A0
Read data
Address device address 11IPSEL01000
Data transfer 1 register address 0/1 A6 A5 A4 A3 A2 A1 A0
Data transfer 2 MSD byte 1 D15 D14 D13 D12 D11 D10 D9 D8
Data transfer3LSD byte2 D7D6D5D4D3D2D1D0
