[PIC®/AVR®/dsPIC®产品]

求教PIC24F16KA101的辅助振荡器的问题

[复制链接]
1002|3
手机看帖
扫描二维码
随时随地手机跟帖
睡神耗子|  楼主 | 2018-1-22 19:17 | 显示全部楼层 |阅读模式
想PIC24F16KA101的辅助振荡器SOSC作为RTCC的时钟源。
但是一直不振。用内部的LPRC没问题。
然后将SOSC作为主时钟源,用示波器可以看出来振荡了。
求教什么原因。跪谢

下面是配置字
#pragma config BWRP = OFF               // Table Write Protect Boot (Boot segment may be written)
#pragma config BSS = OFF                // Boot segment Protect (No boot program Flash segment)

// FGS
#pragma config GWRP = OFF               // General Segment Code Flash Write Protection bit (General segment may be written)
#pragma config GCP = OFF                // General Segment Code Flash Code Protection bit (No protection)

// FOSCSEL
#pragma config FNOSC = FRCDIV           // Oscillator Select (8 MHz FRC oscillator with divide-by-N (FRCDIV))
#pragma config IESO = ON               // Internal External Switch Over bit (Internal External Switchover mode disabled (Two-Speed Start-up disabled))

// FOSC
#pragma config POSCMOD = NONE           // Primary Oscillator Configuration bits (Primary oscillator disabled)
#pragma config OSCIOFNC = ON            // CLKO Enable Configuration bit (CLKO output disabled; pin functions as port I/O)
#pragma config POSCFREQ = HS            // Primary Oscillator Frequency Range Configuration bits (Primary oscillator/external clock input frequency greater than 8 MHz)
#pragma config SOSCSEL = SOSCHP         // SOSC Power Selection Configuration bits (Secondary oscillator configured for high-power operation)
#pragma config FCKSM = CSECMD           // Clock Switching and Monitor Selection (Clock switching is enabled, Fail-Safe Clock Monitor is disabled)

// FWDT
#pragma config WDTPS = PS256            // Watchdog Timer Postscale Select bits (1:256)
#pragma config FWPSA = PR128            // WDT Prescaler (WDT prescaler ratio of 1:128)
#pragma config WINDIS = OFF             // Windowed Watchdog Timer Disable bit (Standard WDT selected; windowed WDT disabled)
#pragma config FWDTEN = OFF              // Watchdog Timer Enable bit (WDT enabled)

// FPOR
#pragma config BOREN = BOR3             // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware; SBOREN bit disabled)
#pragma config PWRTEN = ON              // Power-up Timer Enable bit (PWRT enabled)
#pragma config I2C1SEL = PRI            // Alternate I2C1 Pin Mapping bit (Default location for SCL1/SDA1 pins)
#pragma config BORV = V18               // Brown-out Reset Voltage bits (Brown-out Reset set to lowest voltage (1.8V))
#pragma config MCLRE = ON               // MCLR Pin Enable bit (MCLR pin enabled; RA5 input pin disabled)

// FICD
#pragma config ICS = PGx1               // ICD Pin Placement Select bits (PGC1/PGD1 are used for programming and debugging the device)

// FDS
#pragma config DSWDTPS = DSWDTPS8       // Deep Sleep Watchdog Timer Postscale Select bits (1:131,072 (135 Seconds))
#pragma config DSWDTOSC = SOSC          // DSWDT Reference Clock Select bit (DSWDT uses SOSC as reference clock)
#pragma config RTCOSC = SOSC            // RTCC Reference Clock Select bit (RTCC uses SOSC as reference clock)
#pragma config DSBOREN = ON             // Deep Sleep Zero-Power BOR Enable bit (Deep Sleep BOR enabled in Deep Sleep)
#pragma config DSWDTEN = ON             // Deep Sleep Watchdog Timer Enable bit (DSWDT enabled)

代码就一个地方注意了
OSCCONbits.SOSCEN = 1;
睡神耗子|  楼主 | 2018-2-2 10:23 | 显示全部楼层
问题解决了。
看资料上并没有写,不知道为什么会这样。
OSCCONbits.SOSCEN = 1;该位需要用解锁序列。有些型号是可以直接使能的,这个型号不知道为什么需要解锁。

使用特权

评论回复
michaellengleng| | 2018-2-27 10:20 | 显示全部楼层
PIC24F16KA101  我司代理MICROCHIP 欢迎咨询

使用特权

评论回复
发新帖 我要提问
您需要登录后才可以回帖 登录 | 注册

本版积分规则

34

主题

118

帖子

0

粉丝