User's Manual

Table Of Contents

GC864 Hardware User Guide

1vv0300733 Rev.12 – 2009-06-04

11.6. Using the Alarm Output GPIO6

The GPIO6 pad, when configured as Alarm Output, is controlled by the GC864-QUAD /

PY module and will rise when the alarm starts and fall after the issue of a dedicated

AT command.

This output can be used to power up the GC864-QUAD / PY controlling micro

controller or application at the alarm time, giving you the possibility to program a

timely system wake-up to achieve some periodic actions and completely turn off

either the application and the GC864-QUAD / PY during sleep periods, dramatically

reducing the sleep consumption to few A.

In battery-powered devices this feature will greatly improve the autonomy of the

device.

NOTE:

During RESET the line is set to HIGH logic level.

11.7. Using the Buzzer Output GPIO7

Alternate Function

, the GPIO7 is controlled by the firmware that depends on the

function implemented internally.

This setup places always the GPIO7 pin in

OUTPUT

direction and the corresponding

function must be activated properly by AT#SRP command (refer to

AT commands

specification

Also in this case, the

dummy value

for the pin state can be both “

” or “

”.

• Send the command AT#GPIO=7, 1, 2<cr>:

• Wait for response OK

• Send the command AT#SRP=3

The GPIO7 pin will be set as

Alternate Function

pin with its

dummy

logic status set to

HIGH

value.

The “

Alternate Function

” permits your application to easily implement Buzzer

feature with some small hardware extension of your application as shown in the

sample figure below.