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參數(shù)資料
| 型號： | ADUC832BCP |
| 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 62 kBytes Flash MCU |
| 中文描述： | 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | MO-112AC-1, MQFP-52 |
| 文件頁數(shù)： | 62/80頁 |
| 文件大?。?/td> | 1311K |
| 代理商： | ADUC832BCP |
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REV. 0
–62–
ADuC832
External Memory Interface
In addition to its internal program and data memories, the
ADuC832 can access up to 64 kBytes of external program memory
(ROM/PROM/and so on.) and up to 16 MBytes of external 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 V
DD
), user program execution will start at address 0 of the
internal 62 kBytes Flash/EE code space. When
EA
is low (tied to
ground) user program execution will start at address 0 of the
external code space.
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
ADuC832 as illustrated in Figure 57. 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 ADuC832.
LATCH
EPROM
OE
A8–A15
A0–A7
D0–D7
(INSTRUCTION)
ADuC832
PSEN
P2
ALE
P0
Figure 57. 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 kBytes. External program execution sacrifices two of
the 8-bit ports (P0 and P2) to the function of addressing the pro-
gram 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 58 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)
ADuC832
RD
P2
ALE
P0
WE
WR
Figure 58. External Data Memory Interface (64 K
Address Space)
If access to more than 64 kBytes of RAM is desired, a feature
unique to the ADuC832 allows addressing up to 16 MBytes of
external RAM simply by adding an additional latch, as illustrated
in Figure 59.
LATCH
ADuC832
RD
P2
ALE
P0
WR
LATCH
SRAM
OE
A8–A15
A0–A7
D0–D7
(DATA)
WE
A16–A23
Figure 59. External Data Memory Interface (16 MBytes
Address Space)
In either implementation, Port 0 (P0) serves as a multiplexed
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 ADuC832 (write operation) or the
SRAM (read operation). Port 2 (P2) provides the data pointer
page byte (DPP) to be latched by ALE, followed 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 kBytes
external data memory access is maintained.
Power Supplies
The ADuC832
’
s operational power supply voltage range is 2.7 V
to 5.25 V. Although the guaranteed data sheet specifications are
given only for power supplies within 2.7 V to 3.6 V or
±
10% of
the nominal 5 V level, the chip will function equally well at any
power supply level between 2.7 V and 5.5 V.
Note that Figures 60 and 61 refer to the PQFP package, for
the CSP package connect the extra DV
DD
, DGND, AV
DD
, and
AGND in the same manner.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC832BCP-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V/5V 56-Pin LFCSP EP T/R |
| ADUC832BCPZ | 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 |
| ADUC832BCPZ-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 |
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| ADUC832BS-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP T/R |
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