ATMEGA32U4-MU Atmel, ATMEGA32U4-MU Datasheet - Page 50

• Manufacturer Part Number: ATMEGA32U4-MU
• Description: MCU AVR 32K FLASH 16MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32U4-MU

• 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-VQFN
• Package: 44QFN EP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 26
• Interface Type: EBI/I2S/SPI/TWI/USART/USB
• On-chip Adc: 12-chx10-bit
• Number Of Timers: 5
• 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: ATMEGA32U4-16MU; ATMEGA32U4-16MU

8.0.3
7766F–AVR–11/10
Power-on Reset
Figure 8-1.
Table 8-1.
Notes:
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in supply
voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
Symbol
V
V
V
V
t
CCRR
RST
POR
POT
RST
BODLEVEL [2..0]
1. The Power-on Reset will not work unless the supply voltage has been below V
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
V
Reset signal
VCC Rise Rate to ensure internal Power_on
Reset signal
Minimum pulse width on RESET Pin
RESET Pin Threshold Voltage
CC
Table
Reset Logic
Reset Characteristics
Start Voltage to ensure internal Power-on
8-1. The POR is activated whenever V
Pull-up Resistor
JTAG Reset
Register
FILTER
SPIKE
CKSEL[3:0]
Power-on Reset
Reset Circuit
SUT[1:0]
USB Reset
Watchdog
Brown-out
Detection
Oscillator
Generator
Circuit
Clock
CK
Register (MCUSR)
(1)
MCU Status
DATA BUS
Delay Counters
Condition
5V, 25°C
CC
is below the detection level. The
ATmega16/32U4
Min
-0.1
Vcc
0.3
0.2
TIMEOUT
Typ
400
1.4
1.3
POT
+0.1
Max
0.85
Vcc
2.3
2.3
(falling)
Units
V/ms
ns
V
V
V
V
50