WM_PRJ_M13_UGD_001 - 001
20th July 2004
© 2004
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Wavecom Confidential & Proprietary Information
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7.6 RESET
7.6.1 General presentation
This signal is used to force a reset procedure by providing low level during at
least 500 µs.
This signal has to be considered as an emergency reset only
. A reset procedure
is automatically driven by an internal hardware during the power-up sequence.
This signal can also be used to provide a reset to an external device. It then
behaves as an output. If no external reset is necessary this input can be left
open, if used (emergency reset), it has to be driven by an open collector or an
open drain output:
• RESET pin 14 = 0, for Modem Reset,
• RESET pin 14 = 1, for normal mode.
Pin description
Signal Sub HD 15-Pin connector
Pin number
I/O I/O type Description
RESET 14 I/O SCHMITT Modem Reset
Additional comments on RESET:
The RESET process is activated either
by the external RESET signal or by an
internal signal (coming from a RESET generator). This automatic reset is
activated at Power-up.
The modem remains in RESET mode as long as the RESET signal is held low.
This signal should be used only for “emergency” reset
.
A software reset is always preferred to a hardware reset.
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