ISD94100 Series Technical Reference Manual
Sep 9, 2019
Page
158
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Rev1.09
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NCE
M
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U
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Clock Source Select Control Register 1
(CLK_CLKSEL1)
Before clock switching, the related clock sources (pre-selected and newly-selected) must be turned on.
Register
Offset
R/W Description
Reset Value
CLK_CLKSEL1
0x14
R/W Clock Source Select Control Register 1
0xB377_7703
31
30
29
28
27
26
25
24
WWDTSEL
CLKOSEL
Reserved
UART0SEL
23
22
21
20
19
18
17
16
Reserved
TMR3SEL
Reserved
TMR2SEL
15
14
13
12
11
10
9
8
Reserved
TMR1SEL
Reserved
TMR0SEL
7
6
5
4
3
2
1
0
Reserved
WDTSEL
Bits
Description
[31:30]
WWDTSEL
Window Watchdog Timer Clock Source Selection
10 = Clock source from HCLK/2048.
11 = Clock source from internal low speed RC oscillator (LIRC).
Others = Reserved. Do not use.
[29:28]
CLKOSEL
Clock Divider Clock Source Selection
00 = Clock source from external high speed crystal oscillator (HXT).
01 = Clock source from external low speed crystal oscillator (LXT).
10 = Clock source from HCLK.
11 = Clock source from internal high speed RC oscillator (HIRC).
[27:26]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[25:24]
UART0SEL
UART0 Clock Source Selection
00 = Clock source from external high speed crystal oscillator (HXT).
01 = Clock source from PLL.
10 = Clock source from external low speed crystal oscillator (LXT).
11 = Clock source from internal high speed RC oscillator (HIRC).
[23]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[22:20]
TMR3SEL
TIMER3 Clock Source Selection
000 = Clock source from external high speed crystal oscillator (HXT).
001 = Clock source from external low speed crystal oscillator (LXT).
010 = Clock source from PCLK1.
011 = Clock source from external clock TM3 pin.
Содержание ISD94100 Series
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