Writeflashencrypted; Mode Transitions & Timings; Table 2-14: Writeflashencrypted Command; Table 2-15: Mode Transitions And Timings - Semtech LR1121 User Manual

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.

Table 2-14: WriteFlashEncrypted Command

Byte 0
Data from Host 0x80
Data to Host Stat1
Byte 8
Data1
Data from Host
(15:8)
Data to Host 0x00
Where N must range from 1 to 32 inclusive.
2.4 Mode Transitions & Timings

Table 2-15: Mode Transitions and Timings

Modes and Transitions for a representation of the LR1121 modes and mode transitions.
Table 2-15: Mode Transitions and Timings
Transition
POR to STBY_RC
SLEEP to STBY_RC (no data retention)
if XOSC = XTAL
if XOSC = TCXO
SLEEP to STBY_RC (with data retention)
STBY_RC to STBY_XOSC
STBY_XOSC to FS for sub-GHz
STBY_XOSC to FS for 2.4 GHz band
STBY_XOSC to TX for sub-GHz
STBY_XOSC to TX for 2.4 GHz band
FS to RX (LoRa®, (G)FSK)
FS to TX
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
1 2
Offset
0x03
(31:24) (23:16)
Stat2 0x00
9 10
Data1 Data2
(7:0) (31:24) (23:16)
0x00 0x00
lists the main mode transitions of the LR1121. Please refer to
T Mode Typical value (s)
SW
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3 4
Offset Offset
Offset (7:0)
(15:8)
0x00 0x00
11
Data2 Data2
(15:8)
0x00 0x00
237e3
40e3
10e3
<1000
43
50
80
142
172
39
102
5 6
Data1
(31:24) (23:16)
0x00 0x00
... 4*N+5
Data2
...
(7:0)
0x00 ...
Figure 2-1: LR1121
Proprietary & Confidential
7
Data1
0x00
DataN
(7:0)
0x00
22 of 130
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