參數(shù)資料
型號: AT89C2051-24PC
廠商: Atmel
文件頁數(shù): 14/19頁
文件大?。?/td> 0K
描述: IC MICRO CTRL 24MHZ 20DIP
標(biāo)準(zhǔn)包裝: 18
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: UART/USART
外圍設(shè)備: LED
輸入/輸出數(shù): 15
程序存儲(chǔ)器容量: 2KB(2K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 20-DIP(0.300",7.62mm)
包裝: 管件
4
0368H–MICRO–6/08
AT89C2051
4.7
XTAL2
Output from the inverting oscillator amplifier.
5.
Oscillator Characteristics
The XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier which can
be configured for use as an on-chip oscillator, as shown in Figure 5-1. Either a quartz crystal or
ceramic resonator may be used. To drive the device from an external clock source, XTAL2
should be left unconnected while XTAL1 is driven as shown in Figure 5-2. There are no require-
ments on the duty cycle of the external clock signal, since the input to the internal clocking
circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low
time specifications must be observed.
Figure 5-1.
Oscillator Connections
Note:
C1, C2 = 30 pF
± 10 pF for Crystals
= 40 pF
± 10 pF for Ceramic Resonators
Figure 5-2.
External Clock Drive Configuration
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