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參數(shù)資料
| 型號： | ADUC834 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | MicroConverter, Dual 16-/24- Bit ADCs with Embedded 62KB FLASH MCU |
| 中文描述： | MicroConverter的，雙與嵌入62KB閃存MCU 16-/24-位ADC |
| 文件頁數(shù)： | 66/72頁 |
| 文件大?。?/td> | 1451K |
| 代理商： | ADUC834 |
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(12 March 2002) REV.
P
rC
ADuC834
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66
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PRELIMINARY TECHNICAL DATA
ADUC834 HARDWARE DE SIGN CONSIDE RAT IONS
T his section outlines some of the key hardware design consid-
erations that must be addressed when integrating the
ADuC834 into any hardware system.
E xternal Memory Interface
In addition to its internal program and data memories, the
ADuC834 can access up to 64 Kbytes of external program
memory (ROM/PROM/etc.) and up to 16 Mbytes of external
data memory (SRAM).
T o select from which code space (internal or external pro-
gram memory) to begin executing instructions, tie the
EA
(external access) pin high or low, respectively. When
EA
is high
(pulled up to V
DD
), user program execution will start at ad-
dress 0 of the internal 62 K bytes Flash/EE code space. When
EA
is low (tied to ground) user program execution will start at ad-
dress 0 of the external code space. When executing from internal
code space accesses to the program space above F7FF hex (62K )
will be read as NOP instructions.
Note that a second very important function of the
EA
pin is
described in the Single Pin Emulation Mode section of this
data sheet.
External program memory (if used) must be connected to
the ADuC834 as illustrated in Figure 54. 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 (PC L ) 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
ADuC834.
LATCH
EPROM
OE
A8
A15
A0
A7
D0
D7
(INSTRUCTION)
ADuC834
P S E N
P2
ALE
P0
Figure 54. 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-pur-
pose I/O.
T hough 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 55 shows a hardware configuration for accessing up
to 64 K bytes of external RAM. T his interface is standard to any
8051 compatible MCU.
LATCH
SRAM
OE
A8
A15
A0
A7
D0
D7
(DATA)
ADuC834
R D
P2
ALE
P0
W E
W R
Figure 55. External Data Memory Interface (64 K Address
Space)
If access to more than 64 K bytes of RAM is desired, a fea-
ture unique to the MicroC onverter allows addressing up to
16 Mbytes of external RAM simply by adding an additional latch
as illustrated in Figure 56.
LATCH
ADuC834
R D
P2
ALE
P0
W R
LATCH
SRAM
OE
A8
A15
A0
A7
D0
D7
(DATA)
W E
A16
A23
Figure 56. External Data Memory Interface (16 M Bytes
Address Space)
In either implementation, Port 0 (P0) serves as a multi-
plexed address/data bus. It emits the low byte of the data pointer
(DPL) as an address, which is latched by a pulse of ALE prior to
data being placed on the bus by the ADuC 834 (write opera-
tion) or the SRAM (read operation). Port 2 (P2) provides the
data pointer page byte (DPP) to be latched by AL E, fol-
lowed by the data pointer high byte (DPH). If no latch is
connected to P2, DPP is ignored by the SRAM, and the 8051
standard of 64 K byte external data memory access is main-
tained.
Detailed timing diagrams of external program and data
memory read and write access can be found in the timing
specification sections of this data sheet.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC834_02 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62 kB Flash MCU |
| ADUC834BCP | 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 12.58MHZ 3.3/5V 56LFCSP - Bulk 制造商:Analog Devices 功能描述: |
| ADUC834BCPZ | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標準包裝: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 外圍設備:欠壓檢測/復位，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 |
| ADUC834BCPZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標準包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設備:欠壓檢測/復位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
| ADUC834BS | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 12.58MHZ 3.3/5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:8BIT MCU +24/16BIT ADC SMD MQFP52 |
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