Reset
Configure
Auxiliary Supply
System (AUCTL1
and AUXCTL2
Registers)
³0DLQ
3URJUDP´
AUXSW-ISR
³1HZ´
Supply?
Updated
high-side SVM
level
(if needed)
Reduce
System
Performance
RETI
(End of ISR)
Updated
high-side SVM
level
(if needed)
5HVWRUH ³)XOO´
System
Performance
Updated
high-side SVM
level
(if needed)
Reduce to
RTC only
Interrupt Request by
AUXxSWIFG
AUX1
AUX2
DVCC
AUXCTL0 Register:
AUXKEY = 0xA5
LOCKAUX = 0
Example
Auxiliary Supply Operation
146
SLAU208Q – June 2008 – Revised March 2018
Copyright © 2008–2018, Texas Instruments Incorporated
Auxiliary Supply System (AUX)
4.2.12 Software Flow
shows a sample software flow chart for the use and control of the auxiliary supply system.
NOTE: Configuration of the auxiliary supply system is required after wakeup from LPMx.5. None of the AUX
registers are retained during LPMx.5.
Figure 4-9. Software Flow Chart
4.2.13 Examples of AUX Operation
The following sections describe sample configurations of the AUX module. Some settings in these
examples do not apply to all devices; see the device-specific data sheet.
4.2.13.1 Example 1
This example shows configuration for running at 25-MHz system frequency at a supply voltage of 3
V ±0.3 V, maintaining that frequency when switching to AUX1 or AUX2.