【经验】中微车规级MCU BAT32A237的IO口引脚P123输入无反应的解决方法
中微的BAT32A237系列是工作温度为-40℃~125℃的车规级MCU,采用ARM的Cortex-M0+内核,最高可工作于48MHz主频,集成I2C、SPI、UART、LIN、CAN总线等多种标准接口,12bit ADC、8bit DAC、比较器,可编程增益放大器等功能。BAT32A237还具有出色的低功耗性能,运行功耗为120μA/MHz@48MHz,在深度睡眠模式下功耗仅0.7μA。广泛适用于车载产品的开发。
BAT32A237的低速时钟引脚P123,在不使用外部晶振的情况下,可以当做普通IO口使用。由于该引脚只有输入功能,如图1所示,所以需要输出功能时,需要避开该IO口。
图1 P12x IO口功能表
当BAT32A237的P123作为输入口使用时,输入高电平,但是读出该引脚寄存器值任然为0,如何解决这个问题?这是因为P123和P124引脚复位模式并不是输入模式,而是低速时钟驱动接口。如果需要使用P123作为普通IO口输入功能使用,需要重新配置该IO口为普通IO口模式。
如图2所示,在system_Bat32a237.c文件中,找到SystemInit函数,在该函数的前面加入CLK_Osc_Setting(OSC_OSCILLATOR, OSC_PORT);代码,将低速时钟接口配置为普通IO口模式,然后再在程序中操作P123输入端口,寄存器值将和IO口电平匹配。
图2 将P123配置为IO口模式
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中微半导体微控制器(MCU)选型表
中微半导体提供以下8位MCU/32位MCU参数选型,主频8MHz-128MHz,电压1.8V-5.5V。
产品型号
|
品类
|
封装形式
|
主频(MHz)
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内核
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工作温度 (℃)
|
电压 (V)
|
Memory Type
|
ROM
|
RAM
|
GPIO
|
DMA
|
Timer
|
WDT/WWDT
|
UART
|
I²C
|
SPI
|
PWME/PWM
|
SAR-ADC-unit
|
SAR-ADC-bit
|
SAR-ADC-ch
|
COMP
|
BAT32A233KC24NA
|
32位通用MCU
|
QFN24
|
64MHz
|
M0+
|
-40℃ ~125℃
|
2.0V~5.5V
|
FLASH
|
32KB
|
4KB
|
21
|
40
|
9
|
1
|
2
|
2+1
|
2+1
|
7
|
1
|
12
|
8
|
2
|
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BAT32A237基于 ARM® Cortex®-M0+的超低功耗 32 位微控制器内置 128K 字节 Flash,丰富的模拟功能,安全机能,定时器及各种通讯接口数据手册
描述- 该资料是关于BAT32A237微控制器的数据手册,详细介绍了其技术规格、功能特性和应用领域。BAT32A237是一款基于ARM Cortex-M0+内核的超低功耗32位微控制器,内置128K字节Flash,具有丰富的模拟功能、安全机制、定时器和多种通讯接口。
型号- BAT32A237KH64FB,BAT32A237KH32FP,BAT32A237系列,BAT32A237KH40,BAT32A237KE24,BAT32A237KH32,BAT32A237KH64,BAT32A237KH40NB,BAT32A237KH48FA,BAT32A237,BAT32A237KE24NA,BAT32A237KH48
【视频】2023年3月30日汽车电子新技术研讨会
国民技术、拓尔微、XSENS、极海、芯海等厂商分享国产车规MCU、AI芯片、惯导模块、激光雷达、智能座舱等全新汽车电子产品与新技术。
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