NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 203

• Manufacturer Part Number: NUMICRO-SDK
• Description: KIT EVAUATION NUC100/120/130/140
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUMICRO-SDK

• Contents: Board, Cable, CD, Nu-Link
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC100, NUC120, NUC130, NUC140

Clock status Register （CLKSTATUS）
These bits of this register are used to monitor if the chip clock source stable or not, and whether
clock switch failed. (Only support in Low Density)
Register
CLKSTATUS CLK_BA+0x0C
CLK_SW_FAI
Bits
[31:8]
[7]
[6:5]
[4]
[3]
[2]
31
23
15
7
L
NuMicro™ NUC100 Series Technical Reference Manual
Offset
Descriptions
Reserved
CLK_SW_FAIL
Reserved
OSC22M_STB
OSC10K_STB
PLL_STB
30
22
14
6
Reserved
R/W
R/W
Reserved
Clock switching fail flag (write-protection bit)
1 = Clock switching failure
0 = Clock switching success
This bit is updated when software switches system clock source. If switch target clock
is stable, this bit will be set to 0. If switch target clock is not stable, this bit will be set to
1.
Write 1 to clear the bit to zero.
Reserved
OSC22M clock source stable flag
1 = OSC22M clock is stable
0 = OSC22M clock is not stable or disabled
This is read only bit
OSC10K clock source stable flag
1 = OSC10K clock is stable
0 = OSC10K clock is not stable or disabled
This is read only bit
PLL clock source stable flag
1 = PLL clock is stable
0 = PLL clock is not stable or disabled
This is read only bit
29
21
13
5
Description
Clock status monitor Register
OSC22M_ST
28
20
12
B
4
- 203 -
Reserved
Reserved
Reserved
OSC10K_ST
27
19
11
B
3
Publication Release Date: Oct 22, 2010
PLL_STB
26
18
10
2
XTL32K_STB XTL12M_STB
25
17
9
1
Revision V1.06
Reset Value
0x0000_00XX
24
16
8
0