ISD94100 Series Technical Reference Manual
Sep 9, 2019
Page
174
of 928
Rev1.09
IS
D
9
410
0
S
ER
IE
S
T
E
C
HN
ICA
L
RE
F
E
RE
NCE
M
AN
U
AL
Clock Frequency Detector Upper Boundary Register
(CLK_CDUPB)
Register
Offset
R/W Description
Reset Value
CLK_CDUPB
0x78
R/W
Clock Frequency Range Detector Upper Boundary
Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
UPERBD
7
6
5
4
3
2
1
0
UPERBD
Bits
Description
[31:10]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[9:0]
UPERBD
HXT Clock Frequency Range Detector Upper Boundary Value
The bits define the maximum value of frequency range detector window.
The HXT detected frequency value is 512 * (the frequency of HXT / the frequency of HIRC)
If the HXT detected frequency value higher than this maximum frequency value (UPERBD),
the HXT Clock Frequency Range Detector Interrupt Flag (HXTFQIF(CLK_CLKDSTS[8])) will
set to 1.