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參數(shù)資料
| 型號(hào)： | DS2252T |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Secure Microcontroller Module(安全的微控制器模塊) |
| 中文描述： | 8-BIT, MICROCONTROLLER, SMA40 |
| 封裝： | SIMM-40 |
| 文件頁(yè)數(shù)： | 5/15頁(yè) |
| 文件大?。?/td> | 125K |
| 代理商： | DS2252T |
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DS2252T
021998 5/15
PIN
DESCRIPTION
35, 37
XTAL2, XTAL1.
Used to connect an external crystal to the internal oscillator. XTAL1 is the input
to an inverting amplifier and XTAL2 is the output.
39
GND –
Logic ground.
2
V
CC
– +5V
.
24
PROG –
Invokes the Bootstrap loader on a falling edge. This signal should be debounced so
that only one edge is detected. If connected to ground, the microcontroller will enter Bootstrap
loading on power up. This signal is pulled up internally.
20
SDI –
Self Destruct Input. A logic 1 applied to this input causes a hardware unlock. This involves
the destruction of Encryption Keys, Vector RAM, and the momentary removal of power from
V
CCO
. This pin should be grounded if not used.
INSTRUCTION SET
The DS2252T executes an instruction set that is object
code compatible with the industry standard 8051 micro-
controller. As a result, software development packages
such as assemblers and compilers that have been writ-
ten for the 8051 are compatible with the DS2252T. A
complete description of the instruction set and operation
are provided in the User’s Guide section of the Secure
Microcontroller Data Book.
MEMORY ORGANIZATION
Figure 2 illustrates the memory map accessed by the
DS2252T. The entire 64K of program and 64K of data
are available to the Byte–wide bus. This preserves the
I/O ports for application use. An alternate configuration
allows dynamic Partitioning of a 64K space as shown in
Figure 3. Any data area not mapped into the NV RAM is
reached via the Expanded bus on Ports 0 and 2. Off–
board program memory is not available for security rea-
sons. Selecting PES=1 provides access to the Real
Time Clock as shown in Figure 4. These selections are
made using Special Function Registers. The memory
map and its controls are covered in detail in the User’s
Guide section of the Secure Microcontroller Data Book.
相關(guān)PDF資料 |
PDF描述 |
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| DS229 | Triple RS232 Transmitter/Receiver(三路RS232發(fā)送器/接收器) |
| DS232A | Dual RS232 Transmitter/Receiver(雙路RS232發(fā)送器/接收器) |
| DS2422 | 1K-Bit 1-Wire RAM with Counters(帶計(jì)數(shù)器的1K位1線串行RAM) |
| DS2423 | 4K-Bit 1-Wire RAM with Counters(帶計(jì)數(shù)器的4K位1線串行RAM) |
| DS2450 | 1-Wire Quad A/D Converter(1線串行四路A/D轉(zhuǎn)換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2252T_06 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Soft Microcontroller Module |
| DS2252T_1 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Secure Microcontroller Module |
| DS2252T08-08 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2252T128-08 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2252T-128-12 | 功能描述:模塊化系統(tǒng) - SOM RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
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