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FAQ
What are the clock sources of Timer controller? Can user select the clock sources independently for each Timer controller? Issue Date：2015-02-10
The clock sources of Timer controller can be divided into internal and external sources of crystal and the number of the clock sources depends on each series of chips.
The supported external clock sources include 4-24 MHz, 32.768 kHz, and GPIO. The supported internal clock sources include system clock HCLK and internal RC of 22.1184 MHz (or 12 MHz).
User can select a different clock source for each Timer controller by setting the TMRx_S bit of CLKSEL1 register.
|
Chip Series |
Timer Controller Clock Source |
||||||
|
CLKSEL1 [TMRx_S] value |
|||||||
|
000 |
001 |
010 |
011 |
100 |
101 |
111 |
|
|
External |
External |
Internal |
GPIO |
Internal RC |
Internal RC |
Internal RC |
|
|
Mini51 Series |
4~24 MHz or |
10 kHz |
HCLK |
T0/T1 |
Reserved |
Reserved |
22.1184 MHz |
|
M051 Series |
4~24 MHz |
Reserved |
HCLK |
*T0/T1/T2/T3 |
Reserved |
*10 kHz |
22.1184 MHz |
|
M058S Series |
4~24 MHz |
Reserved |
HCLK |
T0/T1/T2/T3 |
Reserved |
10 kHz |
22.1184 MHz |
|
M0518 Series |
4~24 MHz |
Reserved |
HCLK |
T0/T1/T2/T3 |
Reserved |
10 kHz |
22.1184 MHz |
|
NUC029xAN Series |
4~24 MHz |
Reserved |
HCLK |
T0/T1/T2/T3 |
Reserved |
10 kHz |
22.1184 MHz |
|
NUC029xAE Series |
4~24 MHz or |
10 kHz |
HCLK |
T0/T1 |
Reserved |
Reserved |
22.1184 MHz |
|
NUC100 Series |
4~24 MHz |
32.768 kHz |
HCLK |
Reserved |
Reserved |
Reserved |
22.1184 MHz |
|
NUC122 Series |
4~24 MHz |
32.768 kHz |
HCLK |
Reserved |
Reserved |
Reserved |
22.1184 MHz |
|
NUC123 Series |
4~24 MHz |
Reserved |
HCLK |
TMx |
10 kHz |
Reserved |
22.1184 MHz |
|
NUC131 Series |
4~24 MHz |
Reserved |
HCLK |
T0/T1/T2/T3 |
Reserved |
10 kHz |
22.1184 MHz |
|
NUC200 Series |
4~24 MHz |
32.768 kHz |
HCLK |
TMx |
Reserved |
10 kHz |
22.1184 MHz |
|
Nano100 Series |
4~24 MHz |
32.768 kHz |
10 kHz |
TMx |
Reserved |
Reserved |
12 MHz |
|
Nano102/112 Series |
4~24 MHz |
32.768 kHz |
10 kHz |
TMx |
12MHz |
Reserved |
Reserved |
|
M451 Series |
4~24 MHz |
32.768 kHz |
PCLK |
T0/T1 or T2/T3 |
10 kHz |
Reserved |
22.1184 MHz |
|
NUC442/472 Series |
4~24 MHz |
32.768 kHz |
PCLK |
TMx |
Reserved |
10 kHz |
22.1184 MHz |
* The 011 & 101 value clock source of M051 Series is M051xxDE only.
| Products: | Microcontrollers ,Arm Cortex-M0 MCUs ,M051 Base Series ,M0518 Series ,Mini51 Base Series ,Nano100/102 Base Series ,Nano110/112 LCD Series ,Nano120 USB Series ,Nano130 Advanced Series ,NUC029 Series ,NUC100/200 Advanced Series ,NUC120/122/123/220 USB Series ,NUC130/230 CAN Series ,NUC131/NUC1311 CAN Series ,NUC140/240 Connectivity Series ,Arm Cortex-M4 MCUs ,M451 Base Series ,M451M Series ,M452 USB Series ,M453 CAN Series ,NUC442/472 Series ,NUC505 Series |
|---|---|
| Applications: | |
| Function: | Peripherals,Clock Control,HIRC,HXT,LIRC,LXT,Timer and PWM,Timer |