Boot And Retest Protection Nvm Control Byte; Nvm Byte Definition 24.3. Prot3_Ctrl - Silicon Laboratories Si4010-C2 Manual

24.12. Boot and Retest Protection NVM Control Byte

The boot process monitors the value of an NVM byte called PROT3_CTRL. There is not a corresponding
hardware register to this byte. It is a value in the Factory region at the beginning of NVM. The register
contains Retest protection flags described above and modification of the boot for User part.
Each bit is write 1 once. Once the bit is programmed it cannot be cleared. The bits are programmable
though the checkboxes in the NVM programmer. Once the bit is set, there is no way to monitor the current
status of the bit in the PROT3_CTRL NVM byte on the device.

NVM Byte Definition 24.3. PROT3_CTRL

Bit 7
NVM_C2_ MTP_C2_
Name
PROT PROT
W W
Type
0
Reset
Bit Name
NVM_C2_ NVM Protection (Disable) When Entering Retest Mode.
7
PROT
This bit corresponds to NVM Disable checkbox on the NVM programmer GUI.
MTP Protection (Disable) When Entering Retest Mode.
MTP_C2_PR
6
OT
This bit corresponds to MTP Disable checkbox on the NVM programmer GUI.
MEM_C2_
RAM Clearing (Content Protection) When Entering Retest Mode.
5
PROT
This bit corresponds to RAM Clear checkbox on the NVM programmer GUI.
Enable the Crystal Oscillator (XO) at the Beginning of the Boot Process.
This is valid in any device programming level, including Factory . Since it can take up to 10ms
for the XO to stabilize and about 3.6 ms to load 1 kB of data from NVM to RAM, the user may
BOOT_XO_
4
decide to enable the XO at the beginning of the boot process so the XO will be stabilizing
ENA
while the device is going through the boot process to save time in the main application.
This bit corresponds to XO Early Enable checkbox on the NVM programmer GUI.
2:3 Reserved
Reserved.
Run the User Code in User Part after Boot Automatically.
For User programming level only, has no effect in other programming levels. Normally when
the part is programmed as User the user code is loaded from NVM to RAM, but is not
1
USER_CONT
executed automatically. If this bit is set, then the user load is executed automatically after boot.
This bit corresponds to Exe User Boot checkbox on the NVM programmer GUI.
0 Reserved
Reserved.
6 5 4
MEM_C2_ BOOT_XO
PROT _ENA
W W
0 0 0
Rev. 1.0
3 2
Reserved USER_
R
0x0
Function
Si4010-C2
1 0
Reserved
CONT
W R
0 0
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