Silicon Laboratories Si4010 Software Programming Manual page 91

Inputs:
None
Outputs:
None
vSys_Shutdown
Description: This function is to be called after an application has finished all tasks for the
given boot. Once called the power to digital and most of the analog hardware is off and the
device enters the extremely low power mode. Following is a list containing operations
performed by this function.
1. Clears bit in HVRAM which means "chip didn't shut down correctly."
2. Sets the PORT_HOLD bit of SYSGEN SFR. This blinds the chip to new button
pushes.
3. Sets the SYSGEN_SHUTDOWN bit of the SYSGEN SFR. This shuts the chip
down. Only HVRAM, sleep timer, and Matrix and Roff mode latches are powered
when the chip is in the shutdown mode.
4. Stop the CPU by setting the STOP bit in the PCON register.
Inputs:
None
Outputs:
None
bSys_GetBootStatus
Description: Returns the boot status byte. For more information on the meaning of boot
status see the boot section in the Si4010 data sheet.
Inputs:
None
Outputs:
Boot status: (BYTE) Status of the last boot sequence.
Rev. 1.0
AN370
91