User manual
GTR64 http://www.matrix.es/GTR64
All general purpose IO (GPIO) is programmable by the user. The I/O8 has alternate functionality already
ssociated 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
a n.
GPIO is programmable for the following features:
n i r out
ev itive or tran e
or direct drive
la vers
• Internal pull-up resistors
In the GTR64, all IO undergoes level shifting with VREF signal.
version of GTR64 s c rnally to 3.6V internal VCC, so the level values
are re to 3
nly b uest, po e the VREF the reference input to
e host side level shifter devices. This enables users of varying technologies to connect directly to the
TC) to maintain accurate timekeeping and to enable
signal VRTC present in pin 7 of the expansion conector. The user must
nal energy device like a battery or super-capacitor to provide back-up power
a 300mF supercap the RTC can be maintain for at least 12 hours.
a
their pplicatio
• A
• L
nput o
el-sens
put
sition-sensitiv
• Open drain
• Po
rity (in ion)
In the actu
al , VREF i onnected inte
ferred .6V.
O y req is it ssible to chang acting as an input, providing
th
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 (R
.
“timestamping” of messages
ith the
The RTC is powered w
connect this pin to an exter
o maintain the RTC. Example. If using
t
he GTR64 can accommodate thi
T s battery or super-cap inside, and the GTR64 can be ordered with this
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
special option by request. Please contact your sales nearest distributor.
3.8. Software Updates
GTR64 Integrators Manual V.1.2 Pag. 22
Preliminary. Subject to change without prior notice