Lantronix 900-691-R manual Serial Perpheral Interface SPI Settings, To Configure SPI Settings

Table 5-2 SPI Configuration Settings

Line Settings

Description

Name

Enter a name or short description for the line, if desired. By default, there is

no name specified. This name is for display only.

State

Select to Enable or Disable the SPI.

Protocol

Select the operational protocol for connection to the SPI:

 None: selects no application to connect to the SPI.

 Monitor: selects Monitor application to connect to the SPI.

Target Speed

Set the target clock speed of the SPI in Hz (range is 234.375 KHz - 30 MHz).

The target speed may be lowered to the closest operating speed capability of

the device. If so, a warning will be noted. 0 or clearing the selection selects

the minimum speed.

Idle Clock Level

Select the level of the clock or clock polarity (CPOL) when the clock is idle:

 Low: the idle clock is at a low level. This is equivalent to CPOL=0.

 High: the idle clock is at a high level. This is equivalent to CPOL=1.

Clock Edge

Select the clock edge or clock phase (CPHA) for latching data:

 First: each bit is latched on the first edge of the clock. This is equivalent to

CPHA=0.

 Second: each bit is latched on the second edge of the clock. This is

equivalent to CPHA=1.

Bits Per Word

Select the number of bits per word to transfer. Choices in drop-down menu

are 8 or 16.

First Transfer

Select the first transfer bit of each word. Choicse in drop-down menu include:

 Most Significant Bit

 Least Signficant Bit

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