Specifications

WM_PRJ_Q2501_PTS_002 - 001
March 2004
confidential ©
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3.3.3 Peripheral buses
One peripheral bus is available on the WISMO Quik Q2501 System Connector.
It can be used to drive SPI peripherals (3-wire interface) or standard 2-wire
peripherals.
The choice between these two types of peripherals is exclusive due to signal
multiplexing.
3.3.3.1 SPI Bus
The SPI bus includes clock (SPI_CLK), I/O (SPI_IO) and enable signals (SPI_EN,
SPI_AUX) complying with SPI bus standard. The maximum speed transfer is
3.25 Mb/s.
Pin description
Signal Pin # I/O I/O type Description
SDA/SPI_IO 28 I/O CMOS/3X SPI data signal
SCL/SPI_CLK 30 O 3X SPI clock
SPI_EN 48 O 3X Main SPI enable signal
Multiplexed with GPO3
SPI_AUX 46 O 3X Auxiliary SPI enable signal
Multiplexed with GPO0
WISMO Q2501
Application
processor
(DTE)
SDA/SPI_IO
SCL/SPI_CLK
SPI_AUX
SPI_EN
Figure 14: Example of SPI bus application