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PIC32CM16/32 GV00 Family Data Sheet
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PIC32CM1602GV00032
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14
SYSCTRL – System Controller
14.6
Functional Description
14.6.7
Digital Frequency Locked Loop (DFLL48M) Operation
14.6.7.1
Basic Operation
Low-Power, 32-bit Cortex-M0+ MCUs with 12-bit ADC, 256-Channel PTC, RTC, and SERCOM
1
Configuration Summary
2
Ordering Information
(1)
3
Block Diagram
4
Pinout and Packaging
5
Signal Description
6
Power Supply and Start-Up Considerations
7
Product Mapping
8
Processor And Architecture
9
Peripheral Dependencies
10
Device Service Unit (DSU)
11
Clock System
12
GCLK - Generic Clock Controller
13
PM - Power Manager
14
SYSCTRL – System Controller
14.1
Overview
14.2
Features
14.3
Block Diagram
14.4
Signal Description
14.5
Peripheral Dependencies
14.6
Functional Description
14.6.1
Principle of Operation
14.6.2
External Multipurpose Crystal Oscillator (XOSC) Operation
14.6.3
32 kHz External Crystal Oscillator (XOSC32K) Operation
14.6.4
32 kHz Internal Oscillator (OSC32K) Operation
14.6.5
32 kHz Ultra Low-Power Internal Oscillator (OSCULP32K) Operation
14.6.6
8 MHz Internal Oscillator (OSC8M) Operation
14.6.7
Digital Frequency Locked Loop (DFLL48M) Operation
14.6.7.1
Basic Operation
14.6.7.1.1
Open-Loop Operation
14.6.7.1.2
Closed-Loop Operation
14.6.7.1.3
Frequency Locking
14.6.7.1.4
Frequency Error Measurement
14.6.7.1.5
Drift Compensation
14.6.7.1.6
Reference Clock Stop Detection
14.6.7.2
Additional Features
14.6.8
3.3V Brown-Out Detector Operation
14.6.9
Voltage Reference System Operation
14.6.10
Voltage Regulator System Operation
14.6.11
Interrupts
14.6.12
Synchronization
14.7
Register Summary
15
WDT – Watchdog Timer
16
RTC – Real-Time Counter
17
EIC – External Interrupt Controller
18
Nonvolatile Memory Controller (NVMCTRL)
19
PORT - I/O Pin Controller
20
Event System (EVSYS)
21
SERCOM – Serial Communication Interface
22
SERCOM USART - SERCOM Synchronous and Asynchronous Receiver and Transmitter
23
Register Summary
24
SERCOM SPI – SERCOM Serial Peripheral Interface
25
SERCOM I
2
C – Inter-Integrated Circuit
26
Timer/Counter (TC)
27
ADC - Analog-to-Digital Converter
28
AC – Analog Comparators
29
DAC – Digital-to-Analog Converter
30
PTC - Peripheral Touch Controller
31
Electrical Specifications 85°C
32
Electrical Specifications 125°C
33
Packaging Information
34
Schematic Checklist
35
Revision History
36
Conventions
37
Acronyms and Abbreviations
38
Product Identification System
Microchip Information
14.6.7.1 Basic Operation