ATmega162 Atmel Corporation, ATmega162 Datasheet - Page 40

• 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

External Clock
Clock output
buffer
40
ATmega162/V
Table 13. Internal RC Oscillator Frequency Range.
To drive the device from an external clock source, XTAL1 should be driven as shown in
20. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 20. External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 14. Start-up Times for the External Clock Selection
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in reset during such changes in the clock frequency.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to
41
When the CKOUT Fuse is programmed, the system clock will be output on PortB 0. This mode is
suitable when chip clock is used to drive other circuits on the system. The clock will be output
also during Reset and the normal operation of PortB will be overridden when the fuse is pro-
OSCCAL Value
SUT1..0
for details.
00
01
10
11
0x3F
0x7F
14.
0x00
Start-up Time from
Power-down and
Power-save
Min Frequency in Percentage of
6 CK
6 CK
6 CK
Nominal Frequency
EXTERNAL
SIGNAL
CLOCK
100%
50%
75%
Additional Delay from
Reset (V
Reserved
4.1 ms
65 ms
CC
–
= 5.0V)
Max Frequency in Percentage of
Nominal Frequency
“System Clock Prescaler” on page
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
100%
150%
200%
2513K–AVR–07/09
Figure