ATMEGA32U4-AU Atmel, ATMEGA32U4-AU Datasheet - Page 28

MCU AVR 32K FLASH 16MHZ 44-TQFP

ATMEGA32U4-AU

Manufacturer Part Number
ATMEGA32U4-AU
Description
MCU AVR 32K FLASH 16MHZ 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar

Specifications of ATMEGA32U4-AU

Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
26
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2.5K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Processor Series
ATMEGA32x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2.5 KB
Interface Type
SPI/TWI/USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
26
Number Of Timers
5
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
12-ch x 10-bit
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
16MHz
Total Internal Ram Size
2.5KB
# I/os (max)
26
Number Of Timers - General Purpose
5
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
TQFP
Controller Family/series
AVR MEGA
No. Of I/o's
26
Eeprom Memory Size
1KB
Ram Memory Size
2.5KB
Cpu Speed
16MHz
Rohs Compliant
Yes
For Use With
ATSTK524 - KIT STARTER ATMEGA32M1/MEGA32C1ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA32U4-16AU
ATMEGA32U4-16AU

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6.1.4
6.1.5
6.1.6
6.1.7
6.1.8
6.2
7766F–AVR–11/10
Clock Sources
ADC Clock – clk
PLL Prescaler Clock – clk
PLL Output Clock – clk
High-Speed Timer Clock– clk
USB Clock – clk
The ADC is provided with a dedicated clock domain. This allows halting the CPU and I/O clocks
in order to reduce noise generated by digital circuitry. This gives more accurate ADC conversion
results.
The PLL requires a 8 MHz input. A prescaler allows user to use either a 8MHz or a 16MHz
source (from a crystal or an external source), using a divider (by 2) if necessary. The output of
the prescaler goes into the PLL Input multiplexer, that allows the user to select either the pres-
caler output of the System Clock Multiplexer, or the Internal 8MHz Calibrated Oscillator.
When enabled, the PLL outputs one frequency among numerous choices between 32MHz and
96 MHz. The output frequency is determined by the PLL clock register. The frequency is inde-
pendent of the power supply voltage. The PLL Output is connected to a postcaler that allows
user to generate two different frequencies (clk
each on them resulting of a selected division ratio (/1, /1.5, /2).
When enabled, the PLL outputs one frequency among numerous choices between 32MHz and
96 MHz, that goes into the PLL Postcaler. The High Speed Timer frequency input is generated
from the PLL Postcaler, that proposes /1, /1.5 and /2 ratios. That can be determined from the
PLL clock register. The High Speed Timer maximum frequency input depends on the power sup-
ply voltage and reaches its maximum of 64 MHz at 5V.
The USB hardware module needs for a 48 MHz clock. This clock is generated from the on-chip
PLL. The output of the PLL passes through the PLL Postcaler where the frequency can be either
divided by 2 or directly connected to the clk
The device has the following clock source options, selectable by Flash Fuse bits as shown
below. The clock from the selected source is input to the AVR clock generator, and routed to the
appropriate modules.
Table 6-1.
Note:
USB
ADC
Device Clocking Option
Low Power Crystal Oscillator
Reserved
Low Frequency Crystal Oscillator
Reserved
Calibrated Internal RC Oscillator
External Clock
Reserved
1. For all fuses “1” means unprogrammed while “0” means programmed.
Pll
PllPresc
Device Clocking Options Select
TMR
USB
(1)
signal.
USB
and clk
TMR
) from the common PLL signal,
ATmega16/32U4
(or EXCKSEL[3:0])
1111 - 1000
0101 - 0100
CKSEL[3:0]
0111 - 0110
0011
0010
0000
0001
28

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