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Low-Power, 32-bit Cortex-M0+ MCU with Advanced Analog and PWM
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ATSAMD21E15
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ATSAMD21E16L
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ATSAMD21E18
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ATSAMD21G16
ATSAMD21G16L
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ATSAMD21G18
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15
GCLK - Generic Clock Controller
15.6
Functional Description
15.6.3
Generic Clock
Features
1
Description
2
Configuration Summary
3
SAM D21 Ordering Information
(1)
4
Block Diagram
5
Pinout
6
Signal Descriptions List
7
I/O Multiplexing and Considerations
8
Power Supply and Start-Up Considerations
9
Product Mapping
10
Memories
11
Processor And Architecture
12
Peripherals Configuration Summary
13
DSU - Device Service Unit
14
Clock System
15
GCLK - Generic Clock Controller
15.1
Overview
15.2
Features
15.3
Block Diagram
15.4
Signal Description
15.5
Product Dependencies
15.6
Functional Description
15.6.1
Principle of Operation
15.6.2
Basic Operation
15.6.3
Generic Clock
15.6.3.1
Enabling a Generic Clock
15.6.3.2
Disabling a Generic Clock
15.6.3.3
Selecting a Clock Source for the Generic Clock
15.6.3.4
Configuration Lock
15.6.4
Additional Features
15.6.5
Sleep Mode Operation
15.6.6
Synchronization
15.7
Register Summary
15.8
Register Description
16
PM – Power Manager
17
SYSCTRL – System Controller
18
WDT – Watchdog Timer
19
RTC – Real-Time Counter
20
DMAC – Direct Memory Access Controller
21
EIC – External Interrupt Controller
22
Nonvolatile Memory Controller (NVMCTRL)
23
PORT - I/O Pin Controller
24
EVSYS – Event System
25
SERCOM – Serial Communication Interface
26
SERCOM USART
27
SERCOM SPI – SERCOM Serial Peripheral Interface
28
SERCOM I
2
C – Inter-Integrated Circuit
29
I2S - Inter-IC Sound Controller
30
TC – Timer/Counter
31
TCC – Timer/Counter for Control Applications
32
USB – Universal Serial Bus
33
ADC – Analog-to-Digital Converter
34
AC – Analog Comparators
35
DAC – Digital-to-Analog Converter
36
Peripheral Touch Controller (PTC)
37
Electrical Characteristics at 85℃
38
Electrical Characteristics at 105°C
39
Electrical Characteristics at 125°C
40
AEC-Q100 125°C Specifications
41
SAM DA1 Electrical Characteristics
42
Appendix A
43
Appendix B
44
Packaging Information
45
Schematic Checklist
46
Conventions
47
Acronyms and Abbreviations
48
Data Sheet Revision History
Microchip Information
15.6.3 Generic Clock
Figure 15-4.
Generic Clock Multiplexer
