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參數(shù)資料
| 型號： | DS2251T |
| 英文描述： | 128k Soft Microcontroller Module |
| 中文描述： | 128k柔性微控制器模塊 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 654K |
| 代理商： | DS2251T |
DS2251T
6 of 20
PIN
71
DESCRIPTION
VRST
-
This I/O pin (open-drain with internal pullup) indicates that the power supply (V
CC
)
has fallen below the V
CCMIN
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 V
CC
=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 V
CC
< V
LI
. Because the micro is lithium backed, this signal is guaranteed
even when V
CC
=0V.
INTB
-
INTB
from the real time clock. This output may be connected to a micro interrupt
input.
55
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.
SQW -
SQW output from the DS1283 Real Time Clock. Can be programmed to output an
1024 Hz square wave.
70
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 User’s Guide section of the
Secure Microcontroller Data Book.
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 User’s Guide section of the Secure Microcontroller Data
Book.
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| DS2422 | 1-Wire Temperature/Datalogger with 8kB Datalog Memory |
| DS2422S | 1-Wire Temperature/Datalogger with 8kB Datalog Memory |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2251T_06 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:128k Soft Microcontroller Module |
| DS2251T08-08 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T08-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T08-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T128-08 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
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