ATMEGA168-15MZ Atmel, ATMEGA168-15MZ Datasheet - Page 302

• Manufacturer Part Number: ATMEGA168-15MZ
• Description: MCU AVR 16K FLASH 15MHZ 32-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA168-15MZ

• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 23
• Eeprom Size: 512 x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Program Memory Size: 16KB (16K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: 2-Wire, SPI, USART, Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Package: 32QFN EP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 16 MHz
• Operating Supply Voltage: 3.3|5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.8
302
Precaution Against OSCCAL Discontinuity
ATmega48/88/168 Automotive
Figure 26-3. Dichotomic Algorithm Used for LIN Slave Clock Re-synchronization
The
value. For one correct re-synchronization, the frequency change must be kept on the same side
of the discontinuity (no change of OSCCAL[7]). Since there will be no device having frequency
changed by more than 10% (see
by more than 10%. Therefore, when calibration tries to cross the border because of subsequent
increase (or decrease) in OSCCAL values, then the routine must be stopped.
example: For parts operating in the lower part of the curve, if New_OSCCAL >127 then
New_OSCCAL = 127. Similar for parts operating on the high side of the discontinuity.
Figure 28-23
illustrates the on-purpose discontinuity of RC Frequency versus OSCCAL
Decrement
Increment
OSCCAL
OSCCAL
Figure
-2% < Delta(TBit) < 2%
Delta(TBit) > 2%
Delta(TBit) < -2%
28-21), thus no reason to change the frequency value
Measuring
actual TBit
N
N
Y
STOP:
Oscillator
Calibrated
7530I–AVR–02/10