January 2001/ version 1.4
WMOi3 Integrated Modem
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4.1.5 BOOT
This input is used to switch the WMOi3 into download mode (backup procedure).
The internal boot procedure is started when this pin is low during the power ON of
the module. In normal mode, this pin has to be left open. If used, this input has to
be driven by an open collector or an open drain. See below an example of
application diagram. See also the software upgrade procedure in General
Guidelines chapter 8
BOOT : pin 23
Switch BOOT
figure 8 : boot procedure
If Switch Boot = 1, Boot pin 23 = 0, to download mode
If Switch Boot = 0, Boot pin 23 = 1, to normal mode
Table 9 : BOOT pin description
Signal Pin number I/O I/O type* Description
BOOT 23 I CMOS SW downloading
*See Table 3 “operating conditions” in subdivision 4.1.1The 50-pin
connector description
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