UMA1021M/C2 Philips Semiconductors (Acquired by NXP), UMA1021M/C2 Datasheet - Page 23

• Manufacturer Part Number: UMA1021M/C2
• Description: UDA1380; Stereo Audio Coder-decoder For MD, CD And MP3
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
9.5
For writing data to a device, four bytes must be sent. Figure 14 explains the data write mode in a signal diagram:
Table 8 L3 write data
Notes
1. First bit in time.
2. Last bit in time.
9.6
For reading from the device, first a prepare-read must be
done. After this, 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 following five steps explain this procedure,
and an example of transmission is given in Fig.15.
2003 Apr 04
The SYSCLK signal must be applied in data write mode.
Addressing mode
Data transfer 1
Data transfer 2
Data transfer 3
One byte with the device address, being ‘00000110’, which is including the LSB code 01 for signalling write to the
device
One byte starting with a logic 0 for signalling write, followed by 7 bits indicating the destination address
Two data bytes.
One byte with the device address, being ‘00000110’,
which is including the LSB code 01 for signalling write to
the device
One byte is sent with the register address from which it
needs to be read. This byte starts with a logic 1, which
indicates that there will be a read action from the register
Stereo audio coder-decoder
for MD, CD and MP3
L3 MODE
Data write mode
Data read mode
device address
register address
MS data byte
LS data byte
DATA TYPE
D15
0
D7
0
0
(1)
D14
A6
D6
1
1
23
The SYSCLK signal must be applied in data read mode.
D13
A5
D5
2
1
One byte with the device address including ‘11’ is sent
to the device, being 00000111. The ‘11’ indicates that
the device must write data to the microcontroller, then
the microcontroller frees the L3DATA-bus so the
UDA1380 can send the register address byte and its
two-byte contents
The device now writes the requested register address
on the bus, indicating whether the requested register
was valid or not (logic 0 means valid, logic 1 means
invalid)
The device writes the data from the requested register
on the bus, being two bytes.
D12
A4
D4
3
0
BIT
D11
D3
A3
4
0
D10
D2
A2
5
0
Product specification
UDA1380
D9
D1
A1
6
0
7
D8
D0
A0
0
(2)