使用CH579的TMR例程，将PB15设置为下拉输入后，即使外部引脚悬空也读出1，PB14 13 12 也是如此。而其他引脚却一切正常。#include?"CH57x_common.h"

__align(4)?UINT32?CapBuf[100];
__align(4)?UINT32?PwmBuf[100];

volatile?UINT8?capFlag?=?0;

void?DebugInit(void)		
{
????GPIOA_SetBits(GPIO_Pin_9);
????GPIOA_ModeCfg(GPIO_Pin_8,?GPIO_ModeIN_PU);
????GPIOA_ModeCfg(GPIO_Pin_9,?GPIO_ModeOut_PP_5mA);
????UART1_DefInit();
}

int?main()
{?????
????UINT8??i;
		UINT32?x?=?0;
??
/*?配置串口调试?*/???
????DebugInit();
????PRINT(?"Start?@ChipID=%02X\n",?R8_CHIP_ID?);
????
????//设置GPIO为下拉，输出结果
????GPIOB_ModeCfg(?GPIO_Pin_15,?GPIO_ModeIN_PD?);
????PRINT("read?res?=?%d\r\n",?GPIOB_ReadPortPin(?GPIO_Pin_15?));
????
#if?0???????/*?定时器0，设定100ms定时器进行IO口闪灯，?PB3-LED?*/
????
????GPIOB_SetBits(?GPIO_Pin_3?);
????GPIOB_ModeCfg(?GPIO_Pin_3,?GPIO_ModeOut_PP_5mA?);

????
????TMR0_TimerInit(?FREQ_SYS/10?);??????????????????//?设置定时时间?100ms
????TMR0_ITCfg(ENABLE,?TMR0_3_IT_CYC_END);??????????//?开启中断
????NVIC_EnableIRQ(?TMR0_IRQn?);

#endif?

#if?1???????/*?定时器3，PWM输出?*/
????
????GPIOA_ResetBits(?GPIO_Pin_2?);????????????//?配置PWM口?PA2
????GPIOA_ModeCfg(?GPIO_Pin_2,?GPIO_ModeOut_PP_5mA?);
????
????TMR3_PWMInit(?High_Level,?PWM_Times_1?);
????TMR3_PWMCycleCfg(?3200?);????????//?周期?100us
????TMR3_Disable();
????TMR3_PWMActDataWidth(?1000?);??????????????//?占空比设置?,?修改占空比必须暂时关闭定时器
????TMR3_Enable();
????
#endif???

#if?1???????/*?定时器1，CAP捕捉，?*/
????PWR_UnitModCfg(?DISABLE,?UNIT_SYS_LSE?);?????//?注意此引脚是LSE晶振引脚，要保证关闭才能使用其他功能
????GPIOA_ResetBits(?GPIO_Pin_10?);?????????????//?配置PWM口?PA10
????GPIOA_ModeCfg(?GPIO_Pin_10,?GPIO_ModeIN_PU?);

????TMR1_CapInit(?Edge_To_Edge?);
????TMR1_CAPTimeoutCfg(?0xFFFFFFFF?);???//?设置捕捉超时时间
????TMR1_DMACfg(?ENABLE,?(UINT16)(UINT32)&CapBuf[0],?(UINT16)(UINT32)&CapBuf[100],?Mode_Single?);
????TMR1_ClearITFlag(?TMR1_2_IT_DMA_END?);??????//?清除中断标志??
????TMR1_ITCfg(ENABLE,?TMR1_2_IT_DMA_END);??????????//?开启DMA完成中断
????NVIC_EnableIRQ(?TMR1_IRQn?);
????
????while(?capFlag?==?0?);
????capFlag?=?0;
????for(?i=0;?i<100;?i++?)
????{
????????printf("%08ld?",?CapBuf[i]&0x1ffffff);??????//?bit26?最高位表示?高电平还是低电平
????}printf("\n");

#endif
#if?1???????/*?定时器2，计数器?*/
		GPIOB_ModeCfg(?GPIO_Pin_11,?GPIO_ModeIN_PD?);
		GPIOPinRemap(?ENABLE,?RB_PIN_TMR2?);
		
		TMR2_CountInit(?FallEdge_To_FallEdge?);
		TMR2_CountOverflowCfg(?1000?);??????????????????//?设置计数上限1000
		
		/*?开启计数溢出中断，计慢1000个周期进入中断?*/???
		TMR2_ClearITFlag(?TMR0_3_IT_CYC_END?);
		NVIC_EnableIRQ(TMR2_IRQn);
		TMR2_ITCfg(?ENABLE,?TMR0_3_IT_CYC_END);

		do
		{
						/*?约0.5s打印一次当前计数值，如果送入脉冲频率较高，可能很快计数溢出，需要按实际情况修改?*/
				x++;
				if(?!(?x?&?0xfffff?)?)	printf("=%ld?",?TMR2_GetCurrentCount());			
		}while(1);?

#endif

#if?1?/*?定时器2,DMA?PWM.*/
????GPIOB_ModeCfg(GPIO_Pin_11,?GPIO_ModeOut_PP_5mA);
????GPIOPinRemap(ENABLE,?RB_PIN_TMR2);

????PRINT("TMR2?DMA?PWM\n");
????TMR2_PWMCycleCfg(120000);?//?周期?2000us
????for(i=0;?i<50;?i++)
????{
??????PwmBuf[i]=2400*i;
????}
????for(i=50;?i<100;?i++)
????{
??????PwmBuf[i]=2400*(100-i);
????}
????TMR2_PWMInit(Low_Level,?PWM_Times_16);
????/*?Note:?DMA须在PWM初始化后进行配置?*/
????TMR2_DMACfg(ENABLE,?(uint16_t)(uint32_t)&PwmBuf[0],?(uint16_t)(uint32_t)&PwmBuf[100],?Mode_LOOP);
????/*?开启计数溢出中断，计慢1000个周期进入中断?*/
????TMR2_ClearITFlag(TMR1_2_IT_DMA_END);
????NVIC_EnableIRQ(TMR2_IRQn);
????TMR2_ITCfg(ENABLE,?TMR1_2_IT_DMA_END);

#endif

????while(1);????
}



void?TMR0_IRQHandler(?void?)????????//?TMR0?定时中断
{
????if(?TMR0_GetITFlag(?TMR0_3_IT_CYC_END?)?)
????{
????????TMR0_ClearITFlag(?TMR0_3_IT_CYC_END?);??????//?清除中断标志
????????GPIOB_InverseBits(?GPIO_Pin_3?);????????
????}
}

void?TMR1_IRQHandler(?void?)????????//?TMR1?定时中断
{
????if(?TMR1_GetITFlag(?TMR1_2_IT_DMA_END?)?)
????{
????????TMR1_ITCfg(DISABLE,?TMR1_2_IT_DMA_END);???????//?使用单次DMA功能+中断，注意完成后关闭此中断使能，否则会一直上报中断。
????????TMR1_ClearITFlag(?TMR1_2_IT_DMA_END?);??????//?清除中断标志??
????????capFlag?=?1;
????????printf("*");
????}
}

void?TMR2_IRQHandler(void)
{
	if(?TMR2_GetITFlag(TMR0_3_IT_CYC_END)?)?
	{
		?TMR2_ClearITFlag(?TMR0_3_IT_CYC_END?);
		?/*?计数器计满，硬件自动清零，重新开始计数?*/
		?/*?用户可自行添加需要的处理?*/
	}
	if(TMR2_GetITFlag(TMR1_2_IT_DMA_END))
	{
			TMR2_ClearITFlag(TMR1_2_IT_DMA_END);
			PRINT("DMA?end\n");
			/*?DMA?结束?*/
			/*?用户可自行添加需要的处理?*/
	}
}

您好579M的这几个引脚与3V3直接相连所以导致上述现象