ATmega16HVA Atmel Corporation, ATmega16HVA Datasheet - Page 41
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ATmega16HVA
Manufacturer Part Number
ATmega16HVA
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16HVA
Flash (kbytes)
16 Kbytes
Pin Count
28
Max. Operating Frequency
4 MHz
Cpu
8-bit AVR
# Of Touch Channels
3
Hardware Qtouch Acquisition
No
Max I/o Pins
6
Ext Interrupts
3
Usb Speed
No
Usb Interface
No
Spi
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
6
Adc Resolution (bits)
12
Adc Speed (ksps)
1.9
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
256
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-20 to 85
I/o Supply Class
1.8 to 9.0
Operating Voltage (vcc)
1.8 to 9.0
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
4
Input Capture Channels
2
32khz Rtc
No
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega16HVA-4TU
Manufacturer:
Atmel
Quantity:
20
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11. System Control and Reset
11.1
11.2
8024A–AVR–04/08
Resetting the AVR
Reset Sources
During reset, all I/O Registers are set to their initial values, and the program starts execution
from the Reset Vector. The instruction placed at the Reset Vector must be a JMP – Absolute
Jump – instruction to the reset handling routine. If the program never enables an interrupt
source, the Interrupt Vectors are not used, and regular program code can be placed at these
locations. The circuit diagram in
page 54
The I/O ports of the AVR are immediately reset to their initial state when a reset source goes
active. This does not require any clock source to be running.
After all reset sources have gone inactive, a delay counter is invoked, stretching the internal
reset. This allows the voltage regulator to reach a stable level before normal operation starts.
The time-out period of the delay counter is defined by the user through the SUT Fuses. The dif-
ferent selections for the delay period are presented in
The ATmega8HVA/16HVA has five sources of reset:
• The Power-on Reset module generates a Power-on Reset when the Voltage Regulator starts
• External Reset. The MCU is reset when a low level is present on the RESET pin for longer than
• Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and the
• Brown-out Reset. The MCU is reset when V
• debugWIRE Reset. In On-chip Debug mode, the debugWIRE resets the MCU when giving the
up.
the minimum pulse length.
Watchdog is enabled.
See “Brown-out Detection” on page 44.
Reset command.
defines the electrical parameters of the reset circuitry.
”Reset Logic” on page 42
REG
is below the Brown-out Reset Threshold, V
”Clock Sources” on page
ATmega8HVA/16HVA
shows the reset logic.
25.
Table 12-2 on
BOT
41
.
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