GTR64 | http://www.matrix.es/GTR64 |
All general purpose IO (GPIO) is programmable by the user. The I/O8 has alternate functionality already associated with it; this is indicated in the default column. This I/O which has alternate function is effectively multiplexed, so that the user chooses through AT commands the appropriate configuration for their application.
GPIO is programmable for the following features:
•An input or output
•
•Open drain or direct drive
•Polarity (inversion)
•Internal
In the GTR64, all IO undergoes level shifting with VREF signal.
In the actual version of GTR64, VREF is connected internally to 3.6V internal VCC, so the level values are referred to 3.6V.
Only by request, is it possible to change the VREF acting as an input, providing the reference input to the host side level shifter devices. This enables users of varying technologies to connect directly to the GR64’s IO by providing a reference from their own application IO.
Users should not that GPIO that is used truly bidirectional cannot be open drain type on both sides. At least one side needs to be able to drive the signal both high and low.
3.7.5 Real Time Clock
The GTR64 contains a real time clock (RTC) to maintain accurate timekeeping and to enable “timestamping” of messages.
The RTC is powered with the signal VRTC present in pin 7 of the expansion conector. The user must connect this pin to an external energy device like a battery or
The GTR64 can accommodate this battery or
3.8. Software Updates
It is possible and sometimes necessary to update the GTR64 software.
Updates must be carried out by a approved technician.
Please contact your supplier for details Service/Programming
GTR64 Integrators Manual V.1.2 Pag. 22
Preliminary. Subject to change without prior notice
