ATmega48 Automotive Atmel Corporation, ATmega48 Automotive Datasheet - Page 30

• Manufacturer Part Number: ATmega48 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega48 Automotive

• Flash (kbytes): 4 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 24
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• 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): 0.5
• Eeprom (bytes): 256
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• 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: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

30
Atmel ATtiny24/44/84 [Preliminary]
Figure 7-3.
When this clock source is selected, start-up times are determined by the SUT Fuses as shown
in
Table 7-8.
When applying an external clock, sudden changes in the applied clock frequency must be
avoided 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 inter-
nal clock frequency while still ensuring stable operation. See
page 31
SUT1..0
Table 7-8 on page
00
01
10
11
for details.
Power-down and Power-save
External Clock Drive Configuration
Start-up Times for the External Clock Selection
Start-up Time from
30.
6CK
6CK
6CK
EXTERNAL
SIGNAL
CLOCK
Additional Delay from
Reserved
14CK + 64ms
14CK + 4ms
CLKI
GND
Reset
14CK
“System Clock Prescaler” on
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
7701E–AVR–02/11