參數(shù)資料
型號: AT90PWM1-16SU
廠商: Atmel
文件頁數(shù): 22/90頁
文件大小: 0K
描述: MCU AVR 8K FLASH 16MHZ 24-SOIC
產品培訓模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 1,116
系列: AVR® 90PWM 照明
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: SPI
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 19
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 8x10b
振蕩器型: 內部
工作溫度: -40°C ~ 105°C
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
包裝: 管件
配用: ATSTK600-RC19-ND - STK600 ROUTING CARD AVR
ATSTK600-SOIC-ND - STK600 SOCKET/ADAPTER FOR SOIC
29
4378C–AVR–09/08
AT90PWM1
frequency of the Watchdog Oscillator is voltage dependent as shown in “Watchdog Oscillator
7.3
Default Clock Source
The device is shipped with CKSEL = “0010”, SUT = “10”, and CKDIV8 programmed. The default
clock source setting is the Internal RC Oscillator with longest start-up 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.
7.4
Low Power Crystal Oscillator
XTAL1 and XTAL2 are input and output, respectively, of an inverting amplifier which can be con-
figured for use as an On-chip Oscillator, as shown in Figure 7-2. Either a quartz crystal or a
ceramic resonator may be used.
This Crystal Oscillator is a low power oscillator, with reduced voltage swing on the XTAL2 out-
put. It gives the lowest power consumption, but is not capable of driving other clock inputs.
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 capacitance, and the
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for
use with crystals are given in Table 7-3. For ceramic resonators, the capacitor values given by
the manufacturer should be used. For more information on how to choose capacitors and other
details on Oscillator operation, refer to the Multi-purpose Oscillator Application Note.
Figure 7-2.
Crystal Oscillator Connections
The Oscillator can operate in three different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 7-3.
Table 7-2.
Number of Watchdog Oscillator Cycles
Typ Time-out (V
CC = 5.0V)
Typ Time-out (V
CC = 3.0V)
Number of Cycles
4.1 ms
4.3 ms
4K (4,096)
65 ms
69 ms
64K (65,536)
Table 7-3.
Crystal Oscillator Operating Modes
CKSEL3..1
Frequency Range
(1) (MHz)
Recommended Range for Capacitors C1 and
C2 for Use with Crystals (pF)
100
0.4 - 0.9
XTAL2
XTAL1
GND
C2
C1
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