ATmega16A Atmel Corporation, ATmega16A Datasheet - Page 28

• Manufacturer Part Number: ATmega16A
• Manufacturer: Atmel Corporation

Specifications of ATmega16A

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8.6
28
External RC Oscillator
ATmega16A
Table 8-5.
Note:
For timing insensitive applications, the external RC configuration shown in
used. The frequency is roughly estimated by the equation f = 1/(3RC). C should be at least 22
pF. By programming the CKOPT Fuse, the user can enable an internal 36 pF capacitor between
XTAL1 and GND, thereby removing the need for an external capacitor. For more information on
Oscillator operation and details on how to choose R and C, refer to the External RC Oscillator
application note.
Figure 8-3.
The Oscillator can operate in four different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3:0 as shown in
Table 8-6.
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table
SUT1:0
00
01
10
11
8-7.
1. These options should only be used if frequency stability at start-up is not important for the
application.
CKSEL3:0
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Start-up Time from
External RC Configuration
External RC Oscillator Operating Modes
Power-down and
0101
0110
0111
1000
Power-save
1K CK
1K CK
32K CK
(1)
(1)
C
R
V
CC
Additional Delay
(V
from Reset
NC
CC
4.1 ms
65 ms
65 ms
= 5.0V)
Reserved
Frequency Range (MHz)
XTAL2
XTAL1
GND
Recommended Usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
8.0 - 12.0
0.1 ≤ 0.9
0.9 - 3.0
3.0 - 8.0
Table
Figure 8-3
8154B–AVR–07/09
8-6.
can be