- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄17110 > EVAL-ADUC812QSZ (Analog Devices Inc)BOARD EVALUATION FOR ADUC812 PDF資料下載
參數(shù)資料
| 型號： | EVAL-ADUC812QSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 35/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR ADUC812 |
| 產(chǎn)品培訓(xùn)模塊： | Process Control |
| 標準包裝： | 1 |
| 系列： | QuickStart™ 套件 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | ADuC812 |
| 所含物品： | 評估板、電源、纜線、軟件和說明文檔 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁當前第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁
REV.
ADuC812
–40–
ADuC812 HARDWARE DESIGN CONSIDERATIONS
This section outlines some of the key hardware design consider-
ations that must be addressed when integrating the ADuC812
into any hardware system.
Clock Oscillator
The clock source for the ADuC812 can come either from an
external source or from the internal clock oscillator. To use the
internal clock oscillator, connect a parallel resonant crystal
between Pins 32 and 33, and connect a capacitor from each pin
to ground as shown below.
XTAL2
XTAL1
TO INTERNAL
TIMING CIRCUITS
ADuC812
Figure 35. External Parallel Resonant Crystal Connections
XTAL2
XTAL1
TO INTERNAL
TIMING CIRCUITS
ADuC812
EXTERNAL
CLOCK
SOURCE
Figure 36. Connecting an External Clock Source
Whether using the internal oscillator or an external clock source,
the ADuC812’s specified operational clock speed range is 300 kHz
to 16 MHz. The core is static, and will function all the way
down to dc. But at clock speeds slower that 400 kHz the ADC
will no longer function correctly. Therefore, to ensure specified
operation, use a clock frequency of at least 400 kHz and no
more than 16 MHz.
External Memory Interface
In addition to its internal program and data memories, the
ADuC812 can access up to 64 K bytes of external program
memory (ROM, PROM, etc.) and up to 16 M bytes of exter-
nal data memory (SRAM).
To select from which code space (internal or external program
memory) to begin executing instructions, tie the
EA (external
access) pin high or low, respectively. When
EA is high (pulled
up to VDD), user program execution will start at address 0 of the
internal 8 K bytes Flash/EE code space. When
EA is low (tied
to ground) user program execution will start at address 0 of the
external code space. In either case, addresses above 1FFFH
(8K) are mapped to the external space.
Note that a second very important function of the
EA pin is
described in the Single Pin Emulation Mode section.
External program memory (if used) must be connected to the
ADuC812 as illustrated in Figure 37. Note that 16 I/O lines
(Ports 0 and 2) are dedicated to bus functions during external
program memory fetches. Port 0 (P0) serves as a multiplexed
address/data bus. It emits the low byte of the program counter
(PCL) as an address, and then goes into a float state awaiting
the arrival of the code byte from the program memory. During
the time that the low byte of the program counter is valid on P0,
the signal ALE (Address Latch Enable) clocks this byte into an
address latch. Meanwhile, Port 2 (P2) emits the high byte of the
program counter (PCH), then
PSEN strobes the EPROM and
the code byte is read into the ADuC812.
LATCH
EPROM
OE
A8–A15
A0–A7
D0–D7
(INSTRUCTION)
ADuC812
PSEN
P2
ALE
P0
Figure 37. External Program Memory Interface
Note that program memory addresses are always 16 bits wide, even
in cases where the actual amount of program memory used is less
than 64 K bytes. External program execution sacrifices two of the
8-bit ports (P0 and P2) to the function of addressing the program
memory. While executing from external program memory, Ports 0
and 2 can be used simultaneously for read/write access to external
data memory, but not for general-purpose I/O.
Though both external program memory and external data memory
are accessed by some of the same pins, the two are completely
independent of each other from a software point of view. For example,
the chip can read/write external data memory while executing
from external program memory.
Figure 38 shows a hardware configuration for accessing up to
64 K bytes of external RAM. This interface is standard to any
8051 compatible MCU.
LATCH
SRAM
OE
A8–A15
A0–A7
D0–D7
(DATA)
ADuC812
RD
P2
ALE
P0
WE
WR
Figure 38. External Data Memory Interface
(64K Address Space)
F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ECM30DCWD | CONN EDGECARD 60POS DIP .156 SLD |
| ADR03WARZ-R7 | IC VREF SERIES PREC 2.5V 8SOIC |
| SC43B-1R4 | INDUCTOR SMD 1.4UH 2.20A 7.96MHZ |
| REC5-2415SRWZ/H4/C | CONV DC/DC 5W 9-36VIN 15VOUT |
| VI-J4F-EZ | CONVERTER MOD DC/DC 72V 25W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-ADUC814MK | 制造商:Analog Devices 功能描述:Evaluation Board For Micro-Converter, Small Packag 12-Bit ADC With Embedded Flash MCU 制造商:Analog Devices 功能描述:MICROCONVEMICROCNVRTR, SMALL PACKAG 12-BIT ADC W/ EMBEDDED F - Bulk 制造商:Analog Devices 功能描述:Microcontroller Development Tool |
| EVAL-ADUC814QS | 制造商:Analog Devices 功能描述:8052 ADUC814 QUICKSTART DEV KIT |
| EVAL-ADUC814QS-U | 制造商:Analog Devices 功能描述:QUICK START DEVL SYST EVAL BOARD I.C. - Bulk |
| EVAL-ADUC814QSZ | 功能描述:KIT DEV FOR ADUC814 MICROCONVRTR RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ 套件 標準包裝:1 系列:PICDEM™ 類型:MCU 適用于相關(guān)產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁面:659 (CN2011-ZH PDF) |
| EVAL-ADUC814QSZ | 制造商:Analog Devices 功能描述:EVAL BOARD, ADUC814 8052 CORE ANALOG MCU |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。