UC864-E Hardware User Guide
1vv0300766a Rev.1 - 31/01/08
7.1Reset signal
Signal Function
RESET Phone reset
RESET is used to reset the UC864-E module. Whenever this signal is pulled low, UC864-E is reset. When the device is reset it stops any operation. After the release of the reset UC864-E is unconditionally shut down, without doing any detach operation from the network where it is registered. This behavior is not a proper shut down because any device is requested to issue a detach request on turn off. For this reason the Reset signal must not be used to normally shutting down the device, but only as an emergency exit in the rare case the device remains stuck waiting for some network response.
The RESET is internally controlled on start-up to achieve always a proper power-on reset sequence, so there's no need to control this pin on start-up. It may only be used to reset a device already on that is not responding to any command.
NOTE: do not use this signal to turn off the UC864-E. Use the ON/OFF signal to perform this function or the AT#SHDN command.
Reset Signal Operating levels:
SignalMin Max
RESET Input high | 2.0V* | 2.2V |
| | |
RESET Input low | 0V | 0.2V |
| | |
* This signal is internally pulled up so the pin can be left floating if not used.
If unused, this signal may be left unconnected. If used, then it must always be connected with an open collector transistor, to permit to the internal circuitry the power on reset and under voltage lockout functions.
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