ATMEGA16HVA-4CKU Atmel, ATMEGA16HVA-4CKU Datasheet - Page 44

• Manufacturer Part Number: ATMEGA16HVA-4CKU
• Description: MCU AVR 16K FLASH 4MHZ 36-LGA
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16HVA-4CKU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 7
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 9 V
• Data Converters: A/D 5x12b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-LGA
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• 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, ATAVRSB200, ATAVRSB201
• Minimum Operating Temperature: - 20 C
• On-chip Adc: 12 bit, 5 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.2.2
11.2.3
11.2.4
44
ATmega8HVA/16HVA
External Reset
Watchdog Reset
Brown-out Detection
5. When the internal reset goes low, software starts up and loads the VREF calibration reg-
Now the chip can operate normally, but writing to EEPROM in DUVR mode for single cell appli-
cations should be avoided.
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
running. Shorter pulses are not guaranteed to generate a reset. When the applied signal
reaches the Reset Threshold Voltage – V
MCU after the Time-out period – t
Figure 11-3. External Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 46
Figure 11-4. Watchdog Reset During Operation
ATmega8HVA/16HVA has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detection level
should be interpreted as V
REG
isters to get VREF = 1.100V. As the VREF voltage changes, VREG voltage and VFET
DUVR voltage will rise proportionally to VREF.
level during operation by comparing it to a fixed trigger level V
for details on operation of the Watchdog Timer.
FET
BOT+
Table 29-6 on page
= V
TOUT
BOT
– has expired.
+ V
CK
RST
HYST
– on its positive edge, the delay counter starts the
/2 and V
170) will generate a reset, even if the clock is not
BOT-
= V
BOT
- V
BOT
HYST
. The trigger level has a
/2.
TOUT
8024A–AVR–04/08
. Refer to