User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 134 of 909 2019 Ambiq Micro, Inc.
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3.8.2.15 XTALCTRL Register
XTAL Oscillator Control
OFFSET: 0x00000120
INSTANCE 0 ADDRESS: 0x40020120
XTAL Oscillator Control
Table 158: ADCREFCOMP Register Bits
Bit Name Reset RW Description
31:17 RSVD 0x0 RO
RESERVED
16 ADCRFCMPEN 0x0 RW
ADC Reference comparator power down
15:13 RSVD 0x0 RO
RESERVED
12:8
ADCREFKEEP-
TRIM
0x0 RW
ADC Reference Keeper Trim
7:1 RSVD 0x0 RO
RESERVED
0
ADC_REFCOM-
P_OUT
0x0 RO
Output of the ADC reference comparator
Table 159: XTALCTRL 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
RSVD
XTALICOMPTRIM
XTALIBUFTRIM
PWDBODXTAL
PDNBCMPRXTAL
PDNBCOREXTAL
BYPCMPRXTAL
FDBKDSBLXTAL
XTALSWE
Table 160: XTALCTRL Register Bits
Bit Name Reset RW Description
31:10 RSVD 0x0 RO
RESERVED.
9:8
XTALI-
COMPTRIM
0x3 RW
XTAL ICOMP trim
7:6 XTALIBUFTRIM 0x1 RW
XTAL IBUFF trim