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參數(shù)資料
| 型號： | DS2251T-128-16 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MICROCNTRLR 128K 16MHZ 72SIMM |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 系列： | DS225x |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | SIO，UART/USART |
| 外圍設(shè)備： | 電源故障復位，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器類型： | SRAM |
| RAM 容量： | 128K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 72-SIMM |
| 包裝： | 托盤 |
DS2251T
6 of 22
PIN
DESCRIPTION
71
VRST
. This I/O pin (open-drain with internal pullup) indicates that the power supply (VCC)
has fallen below the VCCMIN level and the micro is in a reset state. When this occurs, the
DS2251T will drive this pin to a logic 0. Because the micro is lithium backed, this signal is
guaranteed even when VCC = 0V. Because it is an I/O pin, it will also force a reset if pulled
low externally. This allows multiple parts to synchronize their power-down resets.
65
PF
. This output goes to a logic 0 to indicate that the micro has switched to lithium backup.
It corresponds to VCC < VLI. Because the micro is lithium backed, this signal is guaranteed
even when VCC = 0V.
55
INTB
. INTB from the real-time clock. This output may be connected to a micro interrupt
input.
68
INTP
. INTP from the real-time clock. This open-drain output requires a pullup and may be
connected to a micro interrupt input.
69
INTA
. INTA from the real-time clock. This output may be connected to a micro interrupt
input.
70
SQW. Square-wave output from the DS1283 real-time clock. Can be programmed to output
a 1024Hz square wave.
INSTRUCTION SET
The DS2251T executes an instruction set that is object code compatible with the industry standard 8051
microcontroller. As a result, software development packages such as assemblers and compilers that have
been written for the 8051 are compatible with the DS2251T.
A complete description of the instruction set and operation are provided in the Secure Microcontroller
User’s Guide.
MEMORY ORGANIZATION
Figure 2 illustrates the memory map accessed by the DS2251T. 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. The user controls
the portion of memory that is actually mapped to the byte-wide bus by selecting the Program Range and
Data Range. Any area not mapped into the NV RAM is reached via the Expanded bus on Ports 0 and 2.
An alternate configuration allows dynamic Partitioning of a 64k space as shown in Figure 3. Selecting
PES = 1 provides access to the real-time clock on the DS2251T and enables PE3 and PE4 for peripheral
access 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 Secure Microcontroller User’s Guide.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2251T-128-16# | 功能描述:模塊化系統(tǒng) - SOM 128K Soft MCU Module RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲容量:8 MB, 16 MB 存儲類型: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 |
| DS2251T32-08 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T-32-12 | 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 存儲容量:8 MB, 16 MB 存儲類型: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 |
| DS2251T32-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T-32-16 | 功能描述:模塊化系統(tǒng) - SOM 32K Soft MCU Module RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲容量:8 MB, 16 MB 存儲類型: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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