ATMEGA32A-MNR Atmel, ATMEGA32A-MNR Datasheet - Page 39

• Manufacturer Part Number: ATMEGA32A-MNR
• Description: IC MCU AVR 32K 16MHZ 44VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32A-MNR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K 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: 44-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.2.1
8155C–AVR–02/11
Power-on Reset
Figure 10-1. Reset Logic
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
V
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
device is kept in RESET after V
when V
Figure 10-2. MCU Start-up, RESET Tied to V
CC
is below the detection level. The POR circuit can be used to trigger the Start-up Reset, as
CC
INTERNAL
TIME-OUT
decreases below the detection level.
RESET
RESET
BODLEVEL
V
“System and Reset Characteristics” on page
CC
BODEN
JTAG Reset
Pull-up Resistor
Register
FILTER
SPIKE
V
V
POT
RST
CC
CKSEL[3:0]
t
rise. The RESET signal is activated again, without any delay,
TOUT
Reset Circuit
Reset Circuit
SUT[1:0]
Reset Circuit
Brown-out
Watchdog
Watchdog
Oscillator
Power-on
Generator
Timer
Clock
CK
MCU Control and Status
Register (MCUCSR)
CC
.
DATA BUS
Delay Counters
299. The POR is activated whenever
TIMEOUT
ATmega32A
39