User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 135 of 909 2019 Ambiq Micro, Inc.
All rights reserved.
3.8.2.16 XTALGENCTRL Register
XTAL Oscillator General Control
OFFSET: 0x00000124
INSTANCE 0 ADDRESS: 0x40020124
XTAL Oscillator General Control
5PWDBODXTAL 0x0 RW
XTAL Power down on brown out.
PWRUPBOD = 0x0 - Power up xtal on BOD
PWRDNBOD = 0x1 - Power down XTAL on BOD.
4
PDNBCMPRX-
TAL
0x1 RW
XTAL Oscillator Power Down Comparator.
PWRUPCOMP = 0x1 - Power up XTAL oscillator comparator.
PWRDNCOMP = 0x0 - Power down XTAL oscillator comparator.
3
PDNBCOREX-
TAL
0x1 RW
XTAL Oscillator Power Down Core.
PWRUPCORE = 0x1 - Power up XTAL oscillator core.
PWRDNCORE = 0x0 - Power down XTAL oscillator core.
2 BYPCMPRXTAL 0x0 RW
XTAL Oscillator Bypass Comparator.
USECOMP = 0x0 - Use the XTAL oscillator comparator.
BYPCOMP = 0x1 - Bypass the XTAL oscillator comparator.
1
FDBKDSBLX-
TAL
0x0 RW
XTAL Oscillator Disable Feedback.
EN = 0x0 - Enable XTAL oscillator comparator.
DIS = 0x1 - Disable XTAL oscillator comparator.
0 XTALSWE 0x0 RW
XTAL Software Override Enable.
OVERRIDE_DIS = 0x0 - XTAL Software Override Disable.
OVERRIDE_EN = 0x1 - XTAL Software Override Enable.
Table 161: XTALGENCTRL 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
XTALKSBIASTRIM
XTALBIASTRIM
ACWARMUP
Table 160: XTALCTRL Register Bits
Bit Name Reset RW Description