ATMEGA16-16AC Atmel, ATMEGA16-16AC Datasheet - Page 37
![IC AVR MCU 16K 16MHZ COM 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA16-16AC
Manufacturer Part Number
ATMEGA16-16AC
Description
IC AVR MCU 16K 16MHZ COM 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA16-16AC
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
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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System Control
and Reset
Resetting the AVR
Reset Sources
2466T–AVR–07/10
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. This is also the case if the Reset Vector is in the Application section while the Interrupt
Vectors are in the Boot section or vice versa. The circuit diagram in
logic.
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 power to reach a stable level before normal operation starts. The time-out
period of the delay counter is defined by the user through the CKSEL Fuses. The different selec-
tions for the delay period are presented in
The ATmega16 has five sources of reset:
•
•
•
•
•
Power-on Reset.
The MCU is reset when the supply voltage is below the Power-on Reset threshold (V
External Reset.
The MCU is reset when a low level is present on the RESET pin for longer than the minimum
pulse length.
Watchdog Reset.
The MCU is reset when the Watchdog Timer period expires and the Watchdog is enabled.
Brown-out Reset.
The MCU is reset when the supply voltage V
(V
JTAG AVR Reset.
The MCU is reset as long as there is a logic one in the Reset Register, one of the scan
chains of the JTAG system. Refer to the section
page 228
Table 15
BOT
) and the Brown-out Detector is enabled.
for details.
defines the electrical parameters of the reset circuitry.
“Clock Sources” on page
CC
is below the Brown-out Reset threshold
“IEEE 1149.1 (JTAG) Boundary-scan” on
25.
Figure 15
ATmega16(L)
shows the reset
POT
).
37
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