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36
UPDI - Unified Program and Debug Interface
36.3
Functional Description
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
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
36.1
Features
36.2
Overview
36.3
Functional Description
36.3.1
Principle of Operation
36.3.2
Operation
36.3.3
UPDI Instruction Set
36.3.4
CRC Checking of Flash During Boot
36.3.5
System Clock Measurement with UPDI
36.3.6
Inter-Byte Delay
36.3.7
System Information Block
36.3.8
Enabling of Key Protected Interfaces
36.3.9
Events
36.3.10
Sleep Mode Operation
36.4
Register Summary
36.5
Register Description
37
Instruction Set Summary
38
Electrical Characteristics
39
Characteristics Graphs
40
Ordering Information
41
Package Drawings
42
Data Sheet Revision History
Microchip Information
36.3 Functional Description
