參數(shù)資料
型號: AT89LP428-20MH
廠商: Atmel
文件頁數(shù): 64/149頁
文件大?。?/td> 0K
描述: MCU 8051 4K FLASH SPI 32VQFN
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 490
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-VFQFN 裸露焊盤
包裝: 托盤
21
3654A–MICRO–8/09
AT89LP428/828
6.1
Crystal Oscillator
When enabled, the internal inverting oscillator amplifier is connected between XTAL1 and
XTAL2 for connection to an external quartz crystal or ceramic resonator. The oscillator may
operate in either high-speed or low-speed mode. Low-speed mode is intended for 32.768 kHz
watch crystals and consumes less power than high-speed mode. The configuration as shown in
Figure 6-1 applies for both high and low speed oscillators. Note that the internal structure of the
device adds about 10 pF of capacitance to both XTAL1 and XTAL2, so that in some cases an
external capacitor may NOT be required. It is recommended that a resistor R1 be connected to
XTAL1, instead of load capacitor C1, for improved startup performance. The total capacitance
on XTAL1 or XTAL2, including the external load capacitor plus internal device load, board trace
and crystal loadings, should not exceed 20 pF.When using the crystal oscillator, P4.0 and P4.1
will have their inputs and outputs disabled. Also, XTAL2 in crystal oscillator mode should not be
used to directly drive a board-level clock without a buffer.
Figure 6-1.
Crystal Oscillator Connections
Note:
1. C2
= 0–10 pF for Crystals
= 0–10 pF for Ceramic Resonators
R1
= 4–5 M
Ω
6.2
External Clock Source
The external clock option disables the oscillator amplifier and allows XTAL1 to be driven directly
by an external clock source as shown in Figure 6-2. XTAL2 may be left unconnected, used as
general-purpose I/O P4.1, or configured to output a divided version of the system clock.
Figure 6-2.
External Clock Drive Configuration
~10 pF
C2
R1
XTAL2 (P4.1)
XTAL1 (P4.0)
GND
NC, GPIO, or
CLKOUT
External
Oscillator
Signal
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AT89LP428-20PU 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89LP51-20AU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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AT89LP51-20MU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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