ATMEGA162V-1MC Atmel, ATMEGA162V-1MC Datasheet - Page 34

• Manufacturer Part Number: ATMEGA162V-1MC
• Description: IC MCU AVR 16K 1.8V 8MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA162V-1MC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 1MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-VQFN Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Clock Sources
Default Clock Source
Crystal Oscillator
34
ATmega162(V/U/L)
The device has the following clock source options, selectable by Flash Fuse bits as
shown below. The clock from the selected source is input to the AVR clock generator,
and routed to the appropriate modules.
Table 5. Device Clocking Options Select
Note:
The various choices for each clocking option is given in the following sections. When the
CPU wakes up from Power-down or Power-save, the selected clock source is used to
time the start-up, ensuring stable Oscillator operation before instruction execution starts.
When the CPU starts from Reset, there is an additional delay allowing the power to
reach a stable level before commencing normal operation. The Watchdog Oscillator is
used for timing this realtime part of the start-up time. The number of WDT Oscillator
cycles used for each Time-out is shown in Table 6. The frequency of the Watchdog
Oscillator is voltage dependent as shown in “ATmega162 Typical Characteristics – Pre-
liminary Data” on page 271.
Table 6. Number of Watchdog Oscillator Cycles
The device is shipped with CKSEL = “0010”, SUT = “10” and CKDIV8 programmed. The
default clock source setting is therefore the Internal RC Oscillator with longest startup
time and an initial system clock prescaling of 8. This default setting ensures that all
users can make their desired clock source setting using an In-System or Parallel
programmer.
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can
be configured for use as an On-chip Oscillator, as shown in Figure 19. Either a quartz
crystal or a ceramic resonator may be used.
C1 and C2 should always be equal for both crystals and resonators. The optimal value
of the capacitors depends on the crystal or resonator in use, the amount of stray capac-
itance, and the electromagnetic noise of the environment. Some initial guidelines for
choosing capacitors for use with crystals are given in Table 7. For ceramic resonators,
the capacitor values given by the manufacturer should be used.
Device Clocking Option
External Crystal/Ceramic Resonator
External Low-frequency Crystal
Calibrated Internal RC Oscillator
External Clock
Reserved
Typ Time-out (V
For all fuses “1” means unprogrammed while “0” means programmed.
4.1 ms
65 ms
CC
= 5.0V)
Typ Time-out (V
4.3 ms
69 ms
CC
= 3.0V)
Number of Cycles
64K (65,536)
4K (4,096)
0111 - 0100
1111 - 1000
0011, 0001
CKSEL3..0
0010
0000
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