ATMEGA48-20MMH Atmel, ATMEGA48-20MMH Datasheet - Page 369
![MCU AVR 4KB FLASH 20MHZ 28QFN](/photos/12/32/123209/28m1-vqfn_sml.jpg)
ATMEGA48-20MMH
Manufacturer Part Number
ATMEGA48-20MMH
Description
MCU AVR 4KB FLASH 20MHZ 28QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA48-20MMH
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Processor Series
ATMEGA48x
Core
AVR8
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Data Bus Width
8 bit
Maximum Clock Frequency
16 MHz
Operating Supply Voltage
2.7 V to 5.5 V
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Table of Contents
1
2
3
4
5
6
7
8
2545S–AVR–07/10
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 5
Resources ................................................................................................. 7
Data Retention .......................................................................................... 7
About Code Examples ............................................................................. 7
AVR CPU Core .......................................................................................... 8
AVR Memories ........................................................................................ 16
System Clock and Clock Options ......................................................... 26
1.1Pin Descriptions .........................................................................................................3
2.1Block Diagram ...........................................................................................................5
2.2Comparison Between ATmega48, ATmega88, and ATmega168 .............................6
6.1Overview ....................................................................................................................8
6.2Architectural Overview ...............................................................................................8
6.3ALU – Arithmetic Logic Unit .......................................................................................9
6.4Status Register ........................................................................................................10
6.5General Purpose Register File ................................................................................11
6.6Stack Pointer ...........................................................................................................12
6.7Instruction Execution Timing ...................................................................................13
6.8Reset and Interrupt Handling ...................................................................................14
7.1Overview ..................................................................................................................16
7.2In-System Reprogrammable Flash Program Memory .............................................16
7.3SRAM Data Memory ................................................................................................18
7.4EEPROM Data Memory ..........................................................................................19
7.5I/O Memory ..............................................................................................................20
7.6Register Description ................................................................................................21
8.1Clock Systems and their Distribution .......................................................................26
8.2Clock Sources .........................................................................................................27
8.3Low Power Crystal Oscillator ...................................................................................28
8.4Full Swing Crystal Oscillator ....................................................................................30
8.5Low Frequency Crystal Oscillator ............................................................................32
8.6Calibrated Internal RC Oscillator .............................................................................32
ATmega48/88/168
i
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