WM8750-EV1M
WM8750 OPERATION
SOFTWARE CONTROL
There are two possible serial software control modes that may be selected to operate the
WM8750. The standard SPI user interface is a 3-wire solution with the second option being
a 2-wire solution.
3-WIRE MODE
To operate the WM8750 in SPI (3-wire) mode, jumper switch SW4 must be set so that pins
1 and 2 are SHORT. The 3-wire serial interface then becomes active on pins 30(CSB),
31(SDIN) and 32(SCLK). The serial interface on the board can be connected to a PC via the
printer port or any other standard parallel port. The port used can be selected through the
software provided. The software supplied with this kit gives the user access to all the
possible features provided by the WM8750. The 3-wire latch, data and clock lines may also
be connected to the board via the test points TP2 (CSB), TP4 (SDIN) and TP3 (SCLK).
Please refer to the WM8750 datasheet for full details of the serial interface timing and all
register features.
CSB
SCLK
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
SDIN
Figure 2 3-Wire Serial Interface
2-WIRE MODE
Rev 2.0, February 2005
10
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
