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23
RTC - Real-Time Counter
23.2
Overview
23.2.1
RTC Block Diagram
ATtiny3224/3226/3227
Introduction
tinyAVR® 2 Family Overview
Features
1
Block Diagram
2
Pinout
3
I/O Multiplexing and Considerations
4
Hardware Guidelines
5
Conventions
6
AVR® CPU
7
Memories
8
Peripherals and Architecture
9
General Purpose I/O Registers
10
NVMCTRL - Nonvolatile Memory Controller
11
CLKCTRL - Clock Controller
12
SLPCTRL - Sleep Controller
13
RSTCTRL - Reset Controller
14
CPUINT - CPU Interrupt Controller
15
EVSYS - Event System
16
PORTMUX - Port Multiplexer
17
PORT - I/O Pin Configuration
18
BOD - Brown-out Detector
19
VREF - Voltage Reference
20
WDT - Watchdog Timer
21
TCA - 16-bit Timer/Counter Type A
22
TCB - 16-Bit Timer/Counter Type B
23
RTC - Real-Time Counter
23.1
Features
23.2
Overview
23.2.1
RTC Block Diagram
23.3
Clocks
23.4
RTC Functional Description
23.5
PIT Functional Description
23.6
Crystal Error Correction
23.7
Events
23.8
Interrupts
23.9
Sleep Mode Operation
23.10
Synchronization
23.11
Debug Operation
23.12
Register Summary
23.13
Register Description
24
USART - Universal Synchronous and Asynchronous Receiver and Transmitter
25
SPI - Serial Peripheral Interface
26
TWI - Two-Wire Interface
27
CRCSCAN - Cyclic Redundancy Check Memory Scan
28
CCL - Configurable Custom Logic
29
AC - Analog Comparator
30
ADC - Analog-to-Digital Converter
31
UPDI - Unified Program and Debug Interface
32
Instruction Set Summary
33
Electrical Characteristics
34
Typical Characteristics
35
Ordering Information
36
Package Drawings
37
Data Sheet Revision History
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23.2.1 RTC Block Diagram
Figure 23-1.
Block Diagram
