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參數(shù)資料
| 型號： | ADUC842BS62-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| 中文描述： | 8-BIT, FLASH, 8.38 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, MO-112AC1, MQFP-52 |
| 文件頁數(shù)： | 72/88頁 |
| 文件大小： | 903K |
| 代理商： | ADUC842BS62-3 |
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ADuC841/ADuC842/ADuC843
HARDWARE DESIGN CONSIDERATIONS
This section outlines some of the key hardware design
considerations that must be addressed when integrating the
ADuC841/ADuC842/ADuC843 into any hardware system.
Clock Oscillator
The clock source for the parts can be generated by the internal
PLL or by an external clock input. To use the internal PLL, con-
nect a 32.768 kHz parallel resonant crystal between XTAL1 and
XTAL2, and connect a capacitor from each pin to ground as
shown in Figure 75. The parts contain an internal capacitance of
18 pF on the XTAL1 and XTAL2 pins, which is sufficient for
most watch crystals. This crystal allows the PLL to lock correctly
to give an f
VCO
of 16.777216 MHz. If no crystal is present, the
PLL will free run, giving an fVCO of 16.7 MHz ±20%. In this mode,
the CD bits are limited to CD = 1, giving a max core clock of
8.38 MHz. This is useful if an external clock input is required.
The part powers up and the PLL will free run; the user then
writes to the CFG842 SFR in software to enable the external clock
input on P3.4. Note that double the required clock must be pro-
vided externally since the part runs at CD = 1. A better solution is
to use the ADuC841 with the external clock.
Rev. 0 | Page 72 of 88
For the ADuC841, connect the crystal in the same manner; external
capacitors should be connected as per the crystal manufacturer’s
recommendations. A minimum capacitance of 20 pF is
recommended on XTAL1 and XTAL2. The ADuC841 will not
operate if no crystal is present.
An external clock may be connected as shown in Figure 76 and
Figure 77.
XTAL2
XTAL1
TO INTERNAL
TIMING CIRCUITS
ADuC841/ADuC842/ADuC843
0
Figure 75. External Parallel Resonant Crystal Connections
XTAL2
XTAL1
TO INTERNAL
TIMING CIRCUITS
ADuC841
0
EXTERNAL
CLOCK
SOURCE
Figure 76. Connecting an External Clock Source (ADuC841)
P3.4
TO INTERNAL
TIMING CIRCUITS
ADuC842/ADuC843
0
EXTERNAL
CLOCK
SOURCE
Figure 77. Connecting an External Clock Source (ADuC842/ADuC843)
Whether using the internal PLL or an external clock source, the
parts’ specified operational clock speed range is 400 kHz to
16.777216 MHz, (20 MHz, ADuC841). The core itself is static,
and functions all the way down to dc. But at clock speeds slower
that 400 kHz, the ADC can no longer function correctly. There-
fore, to ensure specified operation, use a clock frequency of at
least 400 kHz and no more than 20 MHz.
External Memory Interface
In addition to its internal program and data memories, the parts
can access up to 16 MBytes of external data memory (SRAM).
Note that the parts cannot access external program memory.
Figure 78 shows a hardware configuration for accessing up to
64 kBytes of external RAM. This interface is standard to any
8051 compatible MCU.
LATCH
SRAM
OE
A8–A15
A0–A7
D0–D7
(DATA)
ADuC841/
ADuC842/
ADuC843
RD
P2
ALE
P0
WE
WR
0
Figure 78. External Data Memory Interface (64 kBytes Address Space)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC842BS62-5 | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 5V 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 16.7MHZ 5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:IC MICROCONTROLLER |
| ADUC842BSZ62-3 | 功能描述:IC ADC/DAC 12BIT W/MCU 52MQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲器容量:96KB（96K x 8） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587 |
| ADUC842BSZ62-3 | 制造商:Analog Devices 功能描述:IC MICROCONTROLLER |
| ADUC842BSZ62-5 | 功能描述:IC ADC/DAC 12BIT W/MCU 52-MQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲器容量:96KB（96K x 8） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587 |
| ADUC842BSZ62-5 | 制造商:Analog Devices 功能描述:IC MICROCONTROLLER |
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