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ST72T251G2B3 PDF预览

ST72T251G2B3

更新时间: 2024-11-01 22:17:11
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 微控制器和处理器外围集成电路光电二极管可编程只读存储器电动程控只读存储器时钟
页数 文件大小 规格书
11页 70K
描述
8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS

ST72T251G2B3 技术参数

生命周期:Obsolete零件包装代码:DIP
包装说明:SDIP,针数:32
Reach Compliance Code:unknownHTS代码:8542.31.00.01
风险等级:5.51Is Samacsys:N
具有ADC:YES地址总线宽度:
位大小:8最大时钟频率:8 MHz
DAC 通道:NODMA 通道:NO
外部数据总线宽度:JESD-30 代码:R-PDIP-T32
长度:27.94 mmI/O 线路数量:22
端子数量:32片上程序ROM宽度:8
最高工作温度:125 °C最低工作温度:-40 °C
PWM 通道:YES封装主体材料:PLASTIC/EPOXY
封装代码:SDIP封装形状:RECTANGULAR
封装形式:IN-LINE, SHRINK PITCH认证状态:Not Qualified
RAM(字节):256ROM(单词):8192
ROM可编程性:OTPROM座面最大高度:5.08 mm
速度:4 MHz最大供电电压:5.5 V
最小供电电压:3 V标称供电电压:5 V
表面贴装:NO技术:HCMOS
温度等级:AUTOMOTIVE端子形式:THROUGH-HOLE
端子节距:1.778 mm端子位置:DUAL
宽度:10.16 mmuPs/uCs/外围集成电路类型:MICROCONTROLLER
Base Number Matches:1

ST72T251G2B3 数据手册

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APPLICATION NOTE  
ST7 KEYPAD DECODING TECHNIQUES, IMPLEMENTING  
WAKE-UP ON KEYSTROKE  
by Microcontroller Division Application Team  
INTRODUCTION  
The goal of this application note is to present an example of the use of the HALT mode.  
In this application, the MCU (here a ST72251) is waked up by an external interrupt caused by  
someone pressed a key on the 4x4 matrixed keypad.  
1 ST7 / KEYBOARD INTERFACE  
Rows are connected to inputs with pull-up and interrupts (Port C). Columns are connected to  
Port A configured as output. The result of the interrupt (the value of the pressed key) is sent on  
LEDS (Port B) and stored into the X register. In our configuration, we have to add 4 pull-up re-  
sistors on Port A (from PA0 to PA3) to be able to apply a high level on the corresponding pads.  
Figure 1. ST7 / keypad interface set-up  
4x100k  
8x560  
V
PC0  
PC1  
PC2  
PC3  
DD  
ST7  
PA0  
PA1  
PA2  
PA3  
GND  
AN980/1098  
1/10  
1

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