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AVR® DD Family AVR64DD14/20
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AVR64DD20
AVR64DD14
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21
VREF - Voltage Reference
AVR64DD14/20
Introduction
AVR® DD
Family Overview
Features
1
Block Diagram
2
Pinout
3
I/O Multiplexing and Considerations
4
Hardware Guidelines
5
Power Supply
6
Conventions
7
AVR® CPU
8
Memories
9
Peripherals and Architecture
10
GPR - General Purpose Registers
11
NVMCTRL - Nonvolatile Memory Controller
12
CLKCTRL - Clock Controller
13
SLPCTRL - Sleep Controller
14
RSTCTRL - Reset Controller
15
CPUINT - CPU Interrupt Controller
16
EVSYS - Event System
17
PORTMUX - Port Multiplexer
18
PORT - I/O Pin Configuration
19
MVIO - Multi-Voltage I/O
20
BOD - Brown-out Detector
21
VREF - Voltage Reference
21.1
Features
21.2
Overview
21.3
Peripherals Using Voltage References
21.4
Functional Description
21.5
Register Summary
21.6
Register Description
22
WDT - Watchdog Timer
23
TCA - 16-bit Timer/Counter Type A
24
TCB - 16-Bit Timer/Counter Type B
25
TCD - 12-Bit Timer/Counter Type D
26
RTC - Real-Time Counter
27
USART - Universal Synchronous and Asynchronous Receiver and Transmitter
28
SPI - Serial Peripheral Interface
29
TWI - Two-Wire Interface
30
CRCSCAN - Cyclic Redundancy Check Memory Scan
31
CCL - Configurable Custom Logic
32
AC - Analog Comparator
33
ADC - Analog-to-Digital Converter
34
DAC - Digital-to-Analog Converter
35
ZCD - Zero-Cross Detector
36
UPDI - Unified Program and Debug Interface
37
Instruction Set Summary
38
Electrical Characteristics
39
Characteristics Graphs
40
Ordering Information
41
Package Drawings
42
Data Sheet Revision History
Microchip Information
21 VREF - Voltage Reference
