ATMEGA8HVA-4TU Atmel, ATMEGA8HVA-4TU Datasheet - Page 41
![MCU AVR 8K FLASH 4MHZ 28-TSOP](/photos/7/21/72191/313-28-tsop_sml.jpg)
ATMEGA8HVA-4TU
Manufacturer Part Number
ATMEGA8HVA-4TU
Description
MCU AVR 8K FLASH 4MHZ 28-TSOP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16HVA-4CKU.pdf
(196 pages)
Specifications of ATMEGA8HVA-4TU
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
8KB (4K 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
28-TSOP
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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- Download datasheet (3Mb)
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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