User Manual
Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 148 of 909 2019 Ambiq Micro, Inc.
All rights reserved.
Key Register to enable the use of external clock selects via the EXTCLKSEL reg
3.8.2.35 SIMOBUCK4 Register
SIMO Buck Control Reg1
OFFSET: 0x0000035C
INSTANCE 0 ADDRESS: 0x4002035C
SIMO Buck Control Reg1
Table 197: KEXTCLKSEL Register
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
KEXTCLKSEL
Table 198: KEXTCLKSEL Register Bits
Bit Name Reset RW Description
31:0 KEXTCLKSEL 0x0 RW
Key register value.
Key = 0x53 - Key
Table 199: SIMOBUCK4 Register
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
SIMOBUCKIBIASTRIM
SIMOBUCKUVLOMODE
SIMOBUCKPRIORITYSEL
SIMOBUCKCOMP2TIMEOUTEN
SIMOBUCKCOMP2LPEN
SIMOBUCKCLKDIVSEL
SIMOBUCKEXTCLKSEL
SIMOBUCKUVLODRVSTRTRIM
SIMOBUCKUVLOCNTRTRIM
SIMOBUCKZXTRIM
SIMOBUCKMEMLEAKAGETRIM
SIMOBUCKMEMLPDRVSTRTRIM
SIMOBUCKMEMACTDRVSTRTRIM
SIMOBUCKMEMLPLOWTONTRIM
Table 200: SIMOBUCK4 Register Bits
Bit Name Reset RW Description
31:28
SIMOBUCKIBI-
ASTRIM
0x3 RW
simobuck_bias_trim