參數(shù)資料
型號(hào): P89CV51RC2FBC,557
廠商: NXP Semiconductors
文件頁數(shù): 53/76頁
文件大小: 0K
描述: IC 80C51 MCU FLASH 32K 44-TQFP
標(biāo)準(zhǔn)包裝: 800
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: EBI/EMI,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
其它名稱: 568-4255
935284104557
P89CV51RC2FBC
P89CV51RB2_RC2_RD2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 25 August 2009
57 of 76
NXP Semiconductors
P89CV51RB2/RC2/RD2
80C51 with 1 kB RAM, SPI
6.13 System clock and clock options
6.13.1 Clock input options and recommended capacitor values for oscillator
Shown in Figure 26 and Figure 27 are the input and output of an internal inverting
amplier (XTAL1, XTAL2), which can be congured for use as an on-chip oscillator.
When driving the device from an external clock source, XTAL2 should be left disconnected
and XTAL1 should be driven.
At start-up, the external oscillator may encounter a higher capacitive load at XTAL1 due to
interaction between the amplier and its feedback capacitance. However, the capacitance
will not exceed 15 pF once the external signal meets the VIL and VIH specications.
Resonator manufacturer, supply voltage, and other factors may cause circuit performance
to differ from one application to another. C1 and C2 should be adjusted appropriately for
each design. Table 49 shows the typical values for C1 and C2 versus resonator type for
various frequencies.
Table 49.
Recommended values for C1 and C2 by crystal type
Resonator
C1 =C2
Quartz
20 pF to 30 pF
Ceramic
40 pF to 50 pF
Fig 26. Oscillator characteristics (using the on-chip oscillator)
Fig 27. Oscillator characteristics (external clock drive)
002aaa545
XTAL2
XTAL1
VSS
C1
C2
002aaa546
XTAL2
n.c.
XTAL1
external
oscillator
signal
VSS
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