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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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17
SYSCTRL – System Controller
17.6
Functional Description
17.6.8
Fractional Digital Phase-Locked Loop Controller (FDPLL96M) Operation
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
16
PM – Power Manager
17
SYSCTRL – System Controller
17.1
Overview
17.2
Features
17.3
Block Diagram
17.4
Signal Description
17.5
Product Dependencies
17.6
Functional Description
17.6.1
Principle of Operation
17.6.2
External Multipurpose Crystal Oscillator (XOSC) Operation
17.6.3
32kHz External Crystal Oscillator (XOSC32K) Operation
17.6.4
32 kHz Internal Oscillator (OSC32K) Operation
17.6.5
32kHz Ultra Low Power Internal Oscillator (OSCULP32K) Operation
17.6.6
8MHz Internal Oscillator (OSC8M) Operation
17.6.7
Digital Frequency Locked Loop (DFLL48M) Operation
17.6.8
Fractional Digital Phase-Locked Loop Controller (FDPLL96M) Operation
17.6.8.1
Overview
17.6.8.2
Block Diagram
17.6.8.3
Principle of Operation
17.6.8.4
Initialization, Enabling, Disabling and Resetting
17.6.8.5
Reference Clock Switching
17.6.8.6
Loop Divider Ratio updates
17.6.8.7
Digital Filter Selection
17.6.9
3.3V Brown-Out Detector Operation
17.6.10
Voltage Reference System Operation
17.6.11
Voltage Regulator System Operation
17.6.12
DMA Operation
17.6.13
Interrupts
17.6.14
Synchronization
17.7
Register Summary
17.8
Register Description
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
17.6.8 Fractional Digital Phase-Locked Loop Controller (FDPLL96M) Operation
