Semtech LR1121 - Writeflashencrypted; Mode Transitions & Timings; Table 2-14: Writeflashencrypted Command; Table 2-15: Mode Transitions and Timings

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
22 of 130
Semtech
Proprietary & Confidential
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2.3.3 WriteFlashEncrypted
The WriteFlashEncrypted() command writes a new firmware image to the LR1121. More details are supplied in the
AN1200.57 Application Note.
Where N must range from 1 to 32 inclusive.
2.4 Mode Transitions & Timings
Table 2-15: Mode Transitions and Timings lists the main mode transitions of the LR1121. Please refer to Figure 2-1: LR1121
Modes and Transitions for a representation of the LR1121 modes and mode transitions.
Table 2-14: WriteFlashEncrypted Command
Byte 0 1 2 3 4 5 6 7
Data from Host 0x80 0x03
Offset
(31:24)
Offset
(23:16)
Offset
(15:8)
Offset (7:0)
Data1
(31:24)
Data1
(23:16)
Data to Host Stat1 Stat2 0x00 0x00 0x00 0x00 0x00 0x00
Byte 8 9 10 11 ... 4*N+5
Data from Host
Data1
(15:8)
Data1
(7:0)
Data2
(31:24)
Data2
(23:16)
Data2
(15:8)
Data2
(7:0)
...
DataN
(7:0)
Data to Host 0x00 0x00 0x00 0x00 0x00 0x00 ... 0x00
Table 2-15: Mode Transitions and Timings
Transition
T
SW
Mode Typical value (s)
POR to STBY_RC 237e3
SLEEP to STBY_RC (no data retention)
if XOSC = XTAL
if XOSC = TCXO
40e3
10e3
SLEEP to STBY_RC (with data retention) <1000
STBY_RC to STBY_XOSC 43
STBY_XOSC to FS for sub-GHz 50
STBY_XOSC to FS for 2.4 GHz band 80
STBY_XOSC to TX for sub-GHz 142
STBY_XOSC to TX for 2.4 GHz band 172
FS to RX (LoRa®, (G)FSK) 39
FS to TX 102