ATmega328P Automotive Atmel Corporation, ATmega328P Automotive Datasheet - Page 32

• Manufacturer Part Number: ATmega328P Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega328P Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• 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: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• 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

8.6
8.7
32
Calibrated Internal RC Oscillator
128 kHz Internal Oscillator
ATmega328P [Preliminary]
By default, the Internal RC Oscillator provides an approximate 8.0 MHz clock. Though voltage
and temperature dependent, this clock can be very accurately calibrated by the user. See
28-1 on page 307
See
This clock may be selected as the system clock by programming the CKSEL Fuses as shown in
Table
the pre-programmed calibration value into the OSCCAL Register and thereby automatically cal-
ibrates the RC Oscillator. The accuracy of this calibration is shown as Factory calibration in
Table 28-1 on page
By changing the OSCCAL register from SW, see
page
The accuracy of this calibration is shown as User calibration in
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 8-10.
Notes:
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 8-11 on page
Table 8-11.
Note:
The 128 kHz internal Oscillator is a low power Oscillator providing a clock of 128 kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “11” as shown in
Table 8-12.
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
“System Clock Prescaler” on page 34
35, it is possible to get a higher calibration accuracy than by using the factory calibration.
8-10. If selected, it will operate with no external components. During reset, hardware loads
1. The device is shipped with this option selected..
2. If 8 MHz frequency exceeds the specification of the device (depends on V
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to
2.
Fuse can be programmed in order to divide the internal frequency by 8.
14CK + 4.1 ms to ensure programming mode can be entered.
The device is shipped with this option selected.
Nominal Frequency (MHz)
Internal Calibrated RC Oscillator Operating Modes
Start-up times for the internal calibrated RC Oscillator clock selection
128 kHz Internal Oscillator Operating Modes
for more details. The device is shipped with the CKDIV8 Fuse programmed.
Nominal Frequency
307.
32.
8
128 kHz
Power-down and Power-save
“Calibration Byte” on page
Start-up Time from
Reserved
6 CK
6 CK
6 CK
for more details.
“OSCCAL – Oscillator Calibration Register” on
Table
289.
8-12..
Additional Delay from
Reset (V
Table 28-1 on page
14CK + 65 ms
14CK + 4.1 ms
(1)(2)
CKSEL3..0
14CK
0010
CC
CKSEL3..0
(1)
= 5.0V)
0011
(2)
CC
), the CKDIV8
7810A–AVR–11/09
307.
SUT1..0
00
01
10
11
Table