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ST72T251G2B3XXX

更新时间： 2024-11-02 13:14:07
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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
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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
1234567...11

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与ST72T251G2B3XXX相关器件

型号 品牌 获取价格 描述 数据表
ST72T251G2B6 STMICROELECTRONICS

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 		8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS
ST72T251G2B6/XXX ETC

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 		8-Bit Microcontroller
ST72T251G2B6XXX STMICROELECTRONICS

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 		8-BIT, OTPROM, 8MHz, MICROCONTROLLER, PDIP32, 0.400 INCH, PLASTIC, SDIP-32
ST72T251G2M3 STMICROELECTRONICS

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 		8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS
ST72T251G2M3/XXX ETC

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 		8-Bit Microcontroller
ST72T251G2M3XXX STMICROELECTRONICS

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 		8-BIT, OTPROM, 4MHz, MICROCONTROLLER, PDSO28, 0.300 INCH, PLASTIC, SOIC-28
ST72T251G2M6 STMICROELECTRONICS

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 		8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI, I2C AND 2 TIMERS
ST72T251G2M6/XXX ETC

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 		8-Bit Microcontroller
ST72T251G2M6XXX STMICROELECTRONICS

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 		8-BIT, OTPROM, 8MHz, MICROCONTROLLER, PDSO28, 0.300 INCH, PLASTIC, SOIC-28
ST72T2532R4T1 STMICROELECTRONICS

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 		8-BIT MCU WITH NESTED INTERRUPTS, EEPROM, ADC, 16-BIT TIMERS, 8-BIT PWM ART, SPI, SCI, CAN

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