MSP430F5325之全速跑问题

测试的程序使用官方的程序，将主频升至25M,然后循环外部的IO高低电平变化，断开了仿真器，程序直接运行，发现用不了几分钟就跑死了，IO无变化，将N调低，还是会出现跑死现象

Bruce Wei：

楼主你好！

系统是怎么供电的？

试试下面的代码

void Drv_SetVcoreUp (UINT16_T level){ PMMCTL0_H = PMMPW_H; /* Open PMM registers for write */ SVSMHCTL = SVSHE + SVSHRVL0 * level + SVMHE + SVSMHRRL0 * level; /* Set SVS/SVM high side new level */ SVSMLCTL = SVSLE + SVMLE + SVSMLRRL0 * level; /* Set SVM low side to new level */ while ((PMMIFG & SVSMLDLYIFG) == 0); /* Wait till SVM is settled */ PMMIFG &= ~(SVMLVLRIFG + SVMLIFG); /* Clear already set flags */ PMMCTL0_L = PMMCOREV0 * level; /* Set VCore to new level */

if ((PMMIFG & SVMLIFG)) /* Wait till new level reached */ while ((PMMIFG & SVMLVLRIFG) == 0);

SVSMLCTL = SVSLE + SVSLRVL0 * level + SVMLE + SVSMLRRL0 * level; /* Set SVS/SVM low side to new level */ PMMCTL0_H = 0x00; /* Lock PMM registers for write access */}

/*********************************************************************************************************** Drv_UcsInit()** Description : (1) TBD** Argument(s) : none.** Return(s) : none.** Caller(s) : Application.** Note(s) : (1) TBD**********************************************************************************************************/

void Drv_UcsInit (void){ // Increase Vcore setting to level3 to support fsystem=25MHz // NOTE: Change core voltage one level at a time.. Drv_SetVcoreUp (0x01); Drv_SetVcoreUp (0x02); Drv_SetVcoreUp (0x03); UCSCTL3 = SELREF_2; // Set DCO FLL reference = REFO UCSCTL4 |= SELA_2; // Set ACLK = REFO __bis_SR_register(SCG0); // Disable the FLL control loop UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx UCSCTL1 = DCORSEL_7; // Select DCO range 50MHz operation UCSCTL2 = FLLD_1 + 762; // Set DCO Multiplier for 25MHz // (N + 1) * FLLRef = Fdco // (762 + 1) * 32768 = 25MHz // Set FLL Div = fDCOCLK/2 __bic_SR_register(SCG0); // Enable the FLL control loop // Worst-case settling time for the DCO when the DCO range bits have been // changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx // UG for optimization. // 32 x 32 x 25 MHz / 32,768 Hz ~ 780k MCLK cycles for DCO to settle __delay_cycles(782000); // Loop until XT1,XT2 & DCO stabilizes – In this case only DCO has to stabilize do { UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG); // Clear XT2,XT1,DCO fault flags SFRIFG1 &= ~OFIFG; // Clear fault flags }while (SFRIFG1&OFIFG); // Test oscillator fault flag}

Stanford Chen：

回复 Bruce Wei:

我是3.3V供电，代码和上面一致

Stanford Chen：

回复 Bruce Wei:

ACLK，SMCLK为外部晶振32.768k和4M

Lina Lian：

回复 Stanford Chen:

Stanford Chen ，

请问在3.3V供电的基础上，在主频设置为25MHz之前，有否将MSP430F5xxx系列的 core-level升高？默认core-level为0，一般而言，最高能支持主频8MHz。若想运行至25MHz的话，得将core-level升高至3。建议使用core library。

Stanford Chen：

回复 Lina Lian:

已升高core-level升高至3，跑了一个晚上，发现跑飞了

Stanford Chen：

回复 Lina Lian:

频率降至20M，正在测试中，半小时内没出现跑飞现象

Bruce Wei：

回复 Stanford Chen:

建议楼主把自己的代码和MCU周边原理图贴出来。