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参数资料
型号： MV80C51C-20D
厂商： ATMEL CORP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封装： 1.40 MM HEIGHT, QFP-44
文件页数： 81/170页
文件大小： 4133K
代理商： MV80C51C-20D
18
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
6.1.4
ADC Clock – clk
ADC
The ADC is provided with a dedicated clock domain. This allows halting the CPU and I/O clocks in order to reduce
noise generated by digital circuitry. This gives more accurate ADC conversion results.
The ADC is available in ATtiny5/10, only.
6.2
Clock Sources
All synchronous clock signals are derived from the main clock. The device has three alternative sources for the
main clock, as follows:
Calibrated Internal 8 MHz Oscillator (see page 18)
External Clock (see page 18)
Internal 128 kHz Oscillator (see page 19)
See Table 6-3 on page 21 on how to select and change the active clock source.
6.2.1
Calibrated Internal 8 MHz Oscillator
The calibrated internal oscillator provides an approximately 8 MHz clock signal. Though voltage and temperature
dependent, this clock can be very accurately calibrated by the user. See Table 16-2 on page 117, Figure 17-39 on
page 141 and Figure 17-40 on page 141 for more details.
This clock may be selected as the main clock by setting the Clock Main Select bits CLKMS[1:0] in CLKMSR to
0b00. Once enabled, the oscillator will operate with no external components. During reset, hardware loads the cal-
ibration byte into the OSCCAL register and thereby automatically calibrates the oscillator. The accuracy of this
calibration is shown as Factory calibration in Table 16-2 on page 117.
When this oscillator is used as the main clock, the watchdog oscillator will still be used for the watchdog timer and
reset time-out. For more information on the pre-programmed calibration value, see section “Calibration Section” on
page 109.
6.2.2
External Clock
To use the device with an external clock source, CLKI should be driven as shown in Figure 6-2. The external clock
is selected as the main clock by setting CLKMS[1:0] bits in CLKMSR to 0b10.
Figure 6-2.
External Clock Drive Configuration
When applying an external clock, it is required to avoid sudden changes in the applied clock frequency 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.
EXTERNAL
CLOCK
SIGNAL
CLKI
GND
相关PDF资料
PDF描述
MF180C51C-12D 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44
MV80C51T-16D 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44
MS80C51T-20R 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQCC44
MF180C31-25D 8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
MF180C51T-25R 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP44
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