AUX Registers
150
SLAU208Q – June 2008 – Revised March 2018
Copyright © 2008–2018, Texas Instruments Incorporated
Auxiliary Supply System (AUX)
4.3.1 AUXCTL0 Register
Auxiliary Supply Control 0 Register
Figure 4-10. AUXCTL0 Register
15
14
13
12
11
10
9
8
AUXKEY
rw-1
rw-0
rw-0
rw-1
rw-0
rw-1
rw-1
rw-0
7
6
5
4
3
2
1
0
Reserved
AUX2SW
AUX1SW
AUX0SW
LOCKAUX
r0
r0
r0
r0
r-(0)
r-(0)
r-(0)
r/w0-[1]
Table 4-5. AUXCTL0 Register Description
Bit
Field
Type
Reset
Description
15-8
AUXKEY
RW
96h
AUX access key. Always reads as 096h. To enable write access to AUXCTLx
registers, write AUXKEY = 0A5h.
The AUXKEY field can be written only when LOCKAUX bit is clear. AUXKEY and
LOCKAUX can be updated in the same CPU instruction.
7-4
Reserved
R
0h
Reserved. Always reads as 0.
3
AUX2SW
R
0h
AUXVCC2 switch state
0b = AUXVCC2 switch open
1b = AUXVCC2 switch closed
2
AUX1SW
R
0h
AUXVCC1 switch state
0b = AUXVCC1 switch open
1b = AUXVCC1 switch closed
1
AUX0SW
R
0h
DVCC switch state
0b = DVCC switch open
1b = DVCC switch closed
0
LOCKAUX
RW
1h
Lock auxiliary supply system. Can only be written as 0.
LOCKAUX is always set to 1 by hardware after the core was powered down
either due to a complete power cycle of the main suppies (DVCC, AUXVCC1, or
AUXVCC2) or due to LPMx.5 operation.
0b = Auxiliary supply system not locked
1b = Auxiliary supply system is locked and operating from DVCC or AUXVCC1