SL869T3-I Product User Guide
1VV0301546 Rev. 3
Page 25 of 68
2021-03-31
7.
FLASH UPGRADABILITY
The firmware stored in the internal flash memory of the module may be upgraded via the
main serial port (TX/RX).
During normal operation, the BOOT pin should be left floating. This will ensure that the
module executes code from its internal flash memory.
For Over-The-
Air reprogramming, the data is provided by the customer’s host computer.
Telit can provide sample code that can be integrated into his host applications.
To update the FW, the following steps should be performed:
1.
Remove all power to the module.
2.
Connect a USB or serial port cable (depending on the user’s design) to a PC.
3.
Pull the BOOT SELECT pin high (to VCC through a 1K
Ω
resistor
).
4.
Apply main power.
5.
Clearing the entire flash memory prior to re-programming is strongly
recommended.
6.
Run the software utility to re-flash the module. Wait for normal completion.
7.
Remove main power to the module for a minimum of 10 seconds.
8.
Remove the pullup resistor to the BOOT SELECT pin.
9.
Apply main power to the module.
10.
Verify that the module has returned to normal operation.
Alternate re-programming method:
1.
Apply main power to the module.
2.
Connect a serial port cable to a PC.
3.
Pull the BOOT SELECT pin high (to VCC through a 1K
Ω
resistor
).
4.
Assert nRESET (pull low), then release (floating). nRESET should not be held low.
5.
Clearing the entire flash memory prior to re-programming is strongly
recommended.
6.
Run the software utility to re-flash the module. Wait for normal completion.
7.
Return the BOOT SELECT pin to normal (floating).
8.
Verify that the module has returned to normal operation.
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