参数资料
型号: ST72E331N4D0
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP56
封装: 0.600 INCH, WINDOWED, CERAMIC, SDIP-56
文件页数: 29/107页
文件大小: 691K
代理商: ST72E331N4D0
28/107
ST72E331 ST72T331
I/O PORTS (Cont’d)
5.1.2.4 Analog Alternate Function
When the pin is used as an ADC input the I/O must
be configured as input, floating. The analog multi-
plexer (controlled by the ADC registers) switches
the analog voltage present on the selected pin to
the common analog rail which is connected to the
ADC input.
It is recommended not to change the voltage level
or loading on any port pin while conversion is in
progress. Furthermore it is recommended not to
have clocking pins located close to a selected an-
alog pin.
Warning: The analog input voltage level must be
within the limits stated in the Absolute Maximum
Ratings.
5.1.3 I/O Port Implementation
The hardware implementation on each I/O port de-
pends on the settings in the DDR and OR registers
and specific feature of the I/O port such as ADC In-
put (see Figure 21) or true open drain. Switching
these I/O ports from one state to another should
be done in a sequence that prevents unwanted
side effects. Recommended safe transitions are il-
lustrated in Figure 20. Other transitions are poten-
tially risky and should be avoided, since they are
likely to present unwanted side-effects such as
spurious interrupt generation.
Figure 20. Recommended I/O State Transition Diagram
with interrupt
INPUT
OUTPUT
no interrupt
INPUT
push-pull
open-drain
OUTPUT
28
相关PDF资料
PDF描述
ST72T331N2B6S 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP56
ST72T331J2T3S 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP44
ST72T331J4T6S 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
ST72T331N2T6S 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72T331N4T6S 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64
相关代理商/技术参数
参数描述
ST72E331N4D0S 功能描述:8位微控制器 -MCU UV EPROM 16K 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
ST72E4K64-A75EC 制造商:STEC Inc 功能描述:512MB DDR-266 ECC/REG - Bulk
ST72E4K64ML-C06E 制造商:STEC Inc 功能描述:512MB 512MB DDR PC2700 REG/ECC
ST72E4L128ML-C06E 制造商:STEC Inc 功能描述:SimpleTech 1GB PC2700 333MHz ECC Registered DDR DIMM Memory
ST72E63-EPB/US 功能描述:程序设计器 - 基于处理器 ST7 EPROM Programmer RoHS:否 制造商:Olimex Ltd. 产品:Programmers 工具用于评估:XMEGA, MegaAVR, tinyAVR 核心:AVR 接口类型:USB 工作电源电压:1.8 V to 5.5 V