WM8580AGEFT Wolfson Microelectronics Ltd., WM8580AGEFT Datasheet - Page 19
WM8580AGEFT
Manufacturer Part Number
WM8580AGEFT
Description
Multichannel Codec with S/pdif Transceiver
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet
1.WM8580AGEFT.pdf
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Production Data
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With CONTREAD set, a single read-only register can be read back by writing to any other register or
to a dummy register. The register to be read is determined by the READMUX[2:0] bits. When a write
to the device is performed, the device will respond by returning the status byte in the register
selected by the READMUX register bits. This 3-wire interface read back method using a write access
is shown in Figure 7
Table 9 Read-back Control Register
The 3-wire interface readback protocol is shown below. Note that the SDO pin is tri-state unless CSB
is held low; therefore CSB must be held low for the duration of the read.
Figure 7 3-Wire SPI Compatible Interface Continuous Readback
If CONTREAD is set to zero, the user can read back directly from the register by writing to the
register address, to which the device will respond with data. The protocol for this system is shown in
Figure 8 below.
REGISTER ADDRESS
READBACK
R52
34h
BIT
2:0
3
4
CONTREAD
READMUX
READEN
LABEL
[2:0]
DEFAULT
000
0
0
Determines which status register
is to be read back:
000 = Error Register
001 = Channel Status Register 1
010 = Channel Status Register 2
011 = Channel Status Register 3
100 = Channel Status Register 4
101 = Channel Status Register 5
110 = S/PDIF Status Register
Continuous Read Enable.
0 = Continuous read-back mode
disabled
1 = Continuous read-back mode
enabled
Read-back mode enable.
0 = read-back mode disabled
1 = read-back mode enabled
DESCRIPTION
PD Rev 4.3 August 2007
WM8580
19
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