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参数资料
| 型号： | AT89EB5114-TGSIL |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Low-pin-count 8-bit microcontroller with A/D converter |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 83/95页 |
| 文件大小： | 1126K |
| 代理商： | AT89EB5114-TGSIL |
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83
4311A–8051–01/05
Stacked EEPROM
Overview
The AT8xEB5114 features a stacked 2-wire serial data EEPROM. The data EEPROM
allows to save up to 256 bytes. The EEPROM is internally connected to P3.6 and P3.7
which are respectively connected to the SDA and the SCL pins.
Protocol
In order to access this memory, it is necessary to use software subroutines according to
the AT24C02 datasheet. Nevertheless, because the internal pull-up resistors of the
AT8xEB5114 is quite high (around 100K
), the protocol should be slowed in order to be
sure that the SDA pin can rise to the high level before reading it.
Another solution to keep the access to the EEPROM in specification is to work with a
software pull-up.
Using a software pull-up, consists of forcing a low level at the output pin of the microcon-
troller before configuring it as an input (high level).
The C51 the ports are “quasi-bidirectional” ports. It means that the ports can be config-
ured as output low or as input high. In case a port is configured as an output low, it can
sink a current and all internal pull-ups are disconnected. In case a port is configured as
an input high, it is pulled up with a strong pull-up (a few hundreds Ohms resistor) for 2
clock periods. Then, if the port is externally connected to a low level, it is only kept high
with a weak pull up (around 100K
), and if not, the high level is latched high thanks to a
medium pull (around 10k
).
Thus, when the port is configured as an input, and when this input has been read at a
low level, there is a pull-up of around 100K
, which is quite high, to quickly load the
SDA capacitance. So in order to help the reading of a high level just after the reading of
a low level, it is possible to force a transition of the SDA port from an input state (1), to
an output low state (0), followed by a new transition from this output low state to input
state; In this case, the high pull-up has been replaced with a low pull-up which warran-
ties a good reading of the data.
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| AT89EB5114-TGSUL | 功能描述:8位微控制器 -MCU A/D 4K Flash 256EE RC 4PWM SO20 RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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| AT89EVK-01 | 功能描述:开发板和工具包 - 8051 AT83C24 Kit for TDA8004/8024 rplcmnt RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:C8051F960, Si7005 核心: 接口类型:USB 工作电源电压: |
| AT89ISP | 功能描述:电缆组件 ISP CABLE FOR 89S SERIES - ISP CABLE RoHS:否 制造商:Molex 产品:Power Assemblies 类型:Cable Assembly 连接器端口 A:No Connector 连接器端口 A 管脚计数:4 连接器端口 B:No Connector 连接器端口 B 管脚计数: 型式:Male 线规 - 美国线规（AWG）:20, 28 长度:0.305 m 颜色:Black, Red |
| AT89LP2052-16PI | 功能描述:8位微控制器 -MCU Microcontroller RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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