Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
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2.5.3 Alternative download control
If the standard X-modem download procedure does not work correctly, an
alternative download procedure can be selected with the BOOT pin. This
alternative procedure requires a specific downloading software tool.
The Alternative Download procedure can be used for both the GSM & GPS
sections.
The alternative download procedure is started when this input is low during the
power ON of the modem.
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:
•
If Boot pin= 1, module is in normal mode
•
If Boot pin= 0, module is in alternative download mode
Pin description
Signal Pin # I/O I/O type Description
BOOT 32 I CMOS Alternative download control
2.5.4 Reset signal
2.5.4.1 General description
The ~RST signal is used as an input to force a reset procedure by providing low
level. This reset procedure has to be considered as an emergency reset or for
alternative download procedure described above.
This signal can also be used as an output to provide a reset to an external
device. If no external reset is necessary this pin can be left open.
Pin description
Signal Pin # I/O I/O type Description
~RST 34 I/O 4.7k pull-up Reset
Additional comments on reset process:
The reset process is activated EITHER
by the external ~RST signal OR by an
internal signal (coming from a reset generator). This automatic reset is activated
at Power-up.
The module remains in RESET state mode as long as the ~RST signal is held
low.
Warning:
A software reset is always preferred to a hardware reset. This signal
should be used only for “emergency” resets.