ATmega162 Atmel Corporation, ATmega162 Datasheet - Page 38

• Manufacturer Part Number: ATmega162
• Manufacturer: Atmel Corporation

Specifications of ATmega162

• 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: 35
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• 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: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 6
• Input Capture Channels: 2
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Low-frequency
Crystal Oscillator
Calibrated Internal
RC Oscillator
38
ATmega162/V
Notes:
To use a 32.768 kHz watch crystal as the clock source for the device, the Low-frequency Crystal
Oscillator must be selected by setting the CKSEL Fuses to “0100”, “0101”, “0110” or “0111”. The
crystal should be connected as shown in
nal capacitors on XTAL1 and XTAL2 are enabled, thereby removing the need for external
capacitors. The internal capacitors have a nominal value of 10 pF.
When this Oscillator is selected, start-up times are determined by the SUT Fuses (real time-out
from Reset) and CKSEL0 (number of clock cycles) as shown in
Table 9. Start-up Delay from Reset when Low-frequency Crystal Oscillator is Selected
Table 10. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Note:
The calibrated internal RC Oscillator provides a fixed 8.0 MHz clock. The frequency is nominal
value at 3V and 25°C. If 8.0 MHz frequency exceed the specification of the device (depends on
V
ing start-up. See
selected as the system clock by programming the CKSEL Fuses as shown in
selected, it will operate with no external components. During Reset, hardware loads the calibra-
tion byte into the OSCCAL Register and thereby automatically calibrates the RC Oscillator. At
3V and 25°C, this calibration gives a frequency within ±10% of the nominal frequency. Using cal-
ibration methods as described in application notes available at www.atmel.com/avr it is possible
to achieve ±2% accuracy at any given V
chip clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for the Reset
SUT1:0
CKSEL1:0
CC
00
01
10
11
), the CKDIV8 Fuse must be programmed in order to divide the internal frequency by 8 dur-
00
10
01
11
(1)
(1)
1. These options should only be used when not operating close to the maximum frequency of the
2. These options are intended for use with ceramic resonators and will ensure frequency stability
1. These options should only be used if frequency stability at start-up is not important for the
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
application.
Additional Delay from Reset (V
Internal Capacitors
“System Clock Prescaler” on page 41
Enabled?
Yes
Yes
No
No
4.1 ms
65 ms
0 ms
Start-up Time from
Power-down and
CC
Power-save
Figure
CC
and Temperature. When this Oscillator is used as the
32K CK
32K CK
1K CK
1K CK
= 5.0V)
Reserved
19. If CKSEL equals “0110” or “0111”, the inter-
Recommended Usage
Fast rising power or BOD enabled
Fast rising power or BOD enabled
Slowly rising power
for more details. This clock may be
Recommended Usage
Stable Frequency at start-up
Stable Frequency at start-up
Table 9
and
Table
2513K–AVR–07/09
10.
Table
11. If