ATMEGA16A-AUR Atmel, ATMEGA16A-AUR Datasheet - Page 29

• Manufacturer Part Number: ATMEGA16A-AUR
• Description: MCU AVR 16KB FLASH 16MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16A-AUR

• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.7
8154B–AVR–07/09
Calibrated Internal RC Oscillator
Table 8-7.
Note:
The Calibrated Internal RC Oscillator provides a fixed 1.0, 2.0, 4.0, or 8.0 MHz clock. All fre-
quencies are nominal values at 5V and 25°C. This clock may be selected as the sys-tem clock
by programming the CKSEL Fuses as shown in
external components. The CKOPT Fuse should always be unpro-grammed when using this
clock option. During Reset, hardware loads the calibration byte into the OSCCAL Register and
thereby automatically calibrates the RC Oscillator. At 5V, 25°C and 1.0, 2.0, 4.0 or 8.0 MHz
Oscillator frequency selected, this calibration gives a frequency within ± 3% of the nominal fre-
quency. Using calibration methods as described in application notes available at
www.atmel.com/avr it is possible to achieve ±1% accuracy at any given V
When this Oscillator is used as the Chip Clock, the Watchdog Oscillator will still be used for the
Watchdog Timer and for the reset time-out. For more information on the pre-programmed cali-
bration value, see the section
Table 8-8.
Note:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 8-9.
Note:
SUT1:0
SUT1:0
10
00
01
10
11
00
01
11
8-9. XTAL1 and XTAL2 should be left unconnected (NC).
(1)
1. This option should not be used when operating close to the maximum frequency of the device.
1. The device is shipped with this option selected.
1. The device is shipped with this option selected.
CKSEL3:0
Start-up Times for the External RC Oscillator Clock Selection
Start-up Time from
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
0001
Power-down and
0010
0011
0100
Start-up Time from
Power-save
Power-down and
(1)
6 CK
18 CK
18 CK
18 CK
Power-save
6 CK
6 CK
6 CK
(1)
“Calibration Byte” on page
Additional Delay
(V
from Reset
CC
4.1 ms
4.1 ms
65 ms
Additional Delay
= 5.0V)
–
(V
from Reset
CC
4.1 ms
65 ms
Table
Reserved
= 5.0V)
–
Nominal Frequency (MHz)
8-8. If selected, it will operate with no
266.
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
Fast rising power or BOD enabled
1.0
2.0
4.0
8.0
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
ATmega16A
CC
and Temperature.
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