User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide

1vv0300795 Rev.11 – 2010/11/18

12.7. Using the Buzzer Output GPIO7

As 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 “0” or “1”.

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 next sample

figure.

NOTE:

NOTE: NOTE:

NOTE:

To correctly drive a buzzer, a driver must be provided. its characteristics depend on

the buzzer. Refer to your buzzer vendor.