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KTD-S0045-D Page 6 U-Boot Setup

KTT20/pITX Software Guide

2.4.3 GPIO Interface

You can choose between three modes: all interface signals are defined as GPIOs (General Purpose Input

utput) or some special signals have another function (I

, SPI

respectively SDIO). For a detailed

overview about these signals see the 'KTT20/pITX Users Guide' chapter 'Digital I/O Interface'. The signals

are named GPIO16 to GPIO21 respectively GPIO23 to GPIO29, GPIO32 and GPIO36 to GPIO37.

Remark:

the operating systems do not support most of these special functions because the possible appli-

cations can be too different. Following the possible options

gpio

i2c-spi

sdio

2.5 Miscellaneous Menu

This menu part defines several special features (currently only temperature sensor features)

Extended temperature range

Temperature alert output

Temperature high limit

Temperature low limit

2.5.1 Extended Temperature Range

The default temperature range of the sensor is 0

C to +127

C. If you activate the extended range you can

measure a temperature between -55

C and +150

C. There are two options

disabled

enabled

2.5.2 Temperature Alert Output

In some cases it can be useful to disable the alert output. With this submenu is it possible to set this alarm

signal to

disabled

enabled

2.5.4 Temperature High Limit

The temperature high limit controls the alert output. Dependent on the extended temperature setting the

limit can be up to +150

C. The input format is represented by a decimal number with maximal three digits.

Example:

Temp high limit: 75

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 55 56

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