Production Data
WM8716
SOFTWARE CONTROL INTERFACE
The WM8716 can be controlled using a 3-wire serial interface. MD/DM0 (pin 26) is used for the
program data, MC/DM1 (pin 22) is used to clock in the program data and ML/I2S (pin 28) is use to
latch in the program data. The 3-wire interface protocol is shown in Figure 6. CSB/IWO (pin 23) must
be low when writing.
ML/I2S (PIN 28)
MC/DM1 (PIN 27)
MD/DM0 (PIN 26)
B15 B14 B13
B2
B1
B0
Figure 6 Three-Wire Serial Interface
REGISTER MAP
WM8716 controls the special functions using 4 program registers, which are 16-bits long. These
registers are all loaded through input pin MD/DM0. After the 16 data bits are clocked in, ML/I2S is
used to latch in the data to the appropriate register. Table 5 shows the complete mapping of the
4 registers. Note that in hardware differential mode and 8X modes, software control is not available.
The hardware differential mode (Diff[1:0]) clock loss detector disable (CDD) can only be accessed by
writing to M2[8:5] with the pattern 1111. Register M4 is then accessible by setting A[2:0] to 110.
B15
B14
B13
B12
B11
B10
B9
B8
B7
AL7
AR7
-
B6
AL6
AR6
-
B5
AL5
AR5
-
B4
AL4
AR4
IW1
B3
AL3
AR3
B2
AL2
AR2
B1
AL1
AR1
B0
AL0
AR0
M0
M1
M2
M3
M4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A2 (0) A1(0) A0(0) LDL
A2(0) A1(0) A0(1) LDR
A2(0) A1(1) A0(0)
A2(0) A1(1) A0(1) IZD
A2(1) A1(1) A0(0)
-
IW0 OPE DEM MUT
SF1
-
SF0
CK0 REV SR0 ATC LRP
I2S
-
CDD DIFF1 DIFF0
-
-
-
-
Table 5 Mapping of Program Registers
w
PD Rev 4.1September 2006
13
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
