PICDEM FS USB 板仅在触摸 OSC1 时工作？
PICDEM FS USB Board only works when OSC1 is touched?
奇怪的问题。
我有两个 Microchip 的 PICDEM FS USB 演示板（上面有 PIC18F45K50 芯片）。我订购了第二个，因为第一个表现得很奇怪，我认为它有缺陷。但是第二个也是。
行为似乎是芯片上的时钟只在我触摸 OSC1 引脚时运行，就好像我的 body 不知何故充当了芯片的地线。我有一根 male-to-male header 线卡在 OSC1 header 端口，当我捏它时，LED 闪烁，好像系统时钟是 运行。
如果我松开手指，就好像系统时钟停止了一样。我有几个不同的程序，它们会根据时间、按下按钮或转动电位器来闪烁。但它们都有相同的行为：除非我捏住电线，否则什么也不会发生，就像系统时钟停止一样。请注意，将 OSC1 引脚连接到 GND 引脚确实完成了同样的事情，所以我关于我的 body 作为地面的假设似乎没有多大意义。
我在看板的用户指南中找不到任何相关信息，也找不到任何提及相同行为的帮助线程。
我唯一的猜测是，这可能与我在程序中使用的配置标志有关，但据我所知，它们看起来不错：
// PIC18F45K50 Configuration Bit Settings
// CONFIG1L
#pragma config PLLSEL = PLL4X // PLL Selection (4x clock multiplier)
#pragma config CFGPLLEN = OFF // PLL Enable Configuration bit (PLL Disabled (firmware controlled))
#pragma config CPUDIV = NOCLKDIV// CPU System Clock Postscaler (CPU uses system clock (no divide))
#pragma config LS48MHZ = SYS24X4// Low Speed USB mode with 48 MHz system clock (System clock at 24 MHz, USB clock divider is set to 4)
// CONFIG1H
#pragma config FOSC = HSH // Oscillator Selection (HS oscillator, high power 16MHz to 25MHz)
#pragma config PCLKEN = ON // Primary Oscillator Shutdown (Primary oscillator enabled)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF // Internal/External Oscillator Switchover (Oscillator Switchover mode disabled)
// CONFIG2L
#pragma config nPWRTEN = ON // Power-up Timer Enable (Power up timer enabled)
#pragma config BOREN = SBORDIS // Brown-out Reset Enable (BOR enabled in hardware (SBOREN is ignored))
#pragma config BORV = 190 // Brown-out Reset Voltage (BOR set to 1.9V nominal)
#pragma config nLPBOR = OFF // Low-Power Brown-out Reset (Low-Power Brown-out Reset disabled)
// CONFIG2H
#pragma config WDTEN = OFF // Watchdog Timer Enable bits (WDT disabled in hardware (SWDTEN ignored))
#pragma config WDTPS = 32768 // Watchdog Timer Postscaler (1:32768)
// CONFIG3H
#pragma config CCP2MX = RC1 // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
#pragma config PBADEN = OFF // PORTB A/D Enable bit (PORTB<5:0> pins are configured as digital I/O on Reset)
#pragma config T3CMX = RC0 // Timer3 Clock Input MUX bit (T3CKI function is on RC0)
#pragma config SDOMX = RB3 // SDO Output MUX bit (SDO function is on RB3)
#pragma config MCLRE = ON // Master Clear Reset Pin Enable (MCLR pin enabled; RE3 input disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset (Stack full/underflow will cause Reset)
#pragma config LVP = ON // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled if MCLRE is also 1)
#pragma config ICPRT = OFF // Dedicated In-Circuit Debug/Programming Port Enable (ICPORT disabled)
#pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled)
// CONFIG5L
#pragma config CP0 = OFF // Block 0 Code Protect (Block 0 is not code-protected)
#pragma config CP1 = OFF // Block 1 Code Protect (Block 1 is not code-protected)
#pragma config CP2 = OFF // Block 2 Code Protect (Block 2 is not code-protected)
#pragma config CP3 = OFF // Block 3 Code Protect (Block 3 is not code-protected)
// CONFIG5H
#pragma config CPB = OFF // Boot Block Code Protect (Boot block is not code-protected)
#pragma config CPD = OFF // Data EEPROM Code Protect (Data EEPROM is not code-protected)
// CONFIG6L
#pragma config WRT0 = OFF // Block 0 Write Protect (Block 0 (0800-1FFFh) is not write-protected)
#pragma config WRT1 = OFF // Block 1 Write Protect (Block 1 (2000-3FFFh) is not write-protected)
#pragma config WRT2 = OFF // Block 2 Write Protect (Block 2 (04000-5FFFh) is not write-protected)
#pragma config WRT3 = OFF // Block 3 Write Protect (Block 3 (06000-7FFFh) is not write-protected)
// CONFIG6H
#pragma config WRTC = OFF // Configuration Registers Write Protect (Configuration registers (300000-3000FFh) are not write-protected)
#pragma config WRTB = OFF // Boot Block Write Protect (Boot block (0000-7FFh) is not write-protected)
#pragma config WRTD = OFF // Data EEPROM Write Protect (Data EEPROM is not write-protected)
// CONFIG7L
#pragma config EBTR0 = OFF // Block 0 Table Read Protect (Block 0 is not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF // Block 1 Table Read Protect (Block 1 is not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF // Block 2 Table Read Protect (Block 2 is not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF // Block 3 Table Read Protect (Block 3 is not protected from table reads executed in other blocks)
// CONFIG7H
#pragma config EBTRB = OFF // Boot Block Table Read Protect (Boot block is not protected from table reads executed in other blocks)
如有任何帮助，我们将不胜感激。
结果果然如我所料，其中一个配置标志是错误的。更改 FOSC 的设置解决了这个问题。新行是：
#pragma config FOSC = INTOSCIO // Oscillator Selection (Internal oscillator)
作为 PIC 编程的新手，我不确定它期望的外部振荡器是什么，但不知何故它最终成为了我。
如果它能正常工作，板上可能有一个外部振荡器，您必须 select 为它设置了错误的增益设置。这是相同的设置，但是如果您 select 例如 XT 用于需要 HS 的振荡器，那么它将是边缘的并且只有在您触摸它时才开始工作，并且这样做会改变负载电容。
奇怪的问题。
我有两个 Microchip 的 PICDEM FS USB 演示板（上面有 PIC18F45K50 芯片）。我订购了第二个，因为第一个表现得很奇怪，我认为它有缺陷。但是第二个也是。
行为似乎是芯片上的时钟只在我触摸 OSC1 引脚时运行，就好像我的 body 不知何故充当了芯片的地线。我有一根 male-to-male header 线卡在 OSC1 header 端口，当我捏它时，LED 闪烁，好像系统时钟是 运行。
如果我松开手指，就好像系统时钟停止了一样。我有几个不同的程序，它们会根据时间、按下按钮或转动电位器来闪烁。但它们都有相同的行为：除非我捏住电线，否则什么也不会发生，就像系统时钟停止一样。请注意，将 OSC1 引脚连接到 GND 引脚确实完成了同样的事情，所以我关于我的 body 作为地面的假设似乎没有多大意义。
我在看板的用户指南中找不到任何相关信息，也找不到任何提及相同行为的帮助线程。
我唯一的猜测是，这可能与我在程序中使用的配置标志有关，但据我所知，它们看起来不错：
// PIC18F45K50 Configuration Bit Settings
// CONFIG1L
#pragma config PLLSEL = PLL4X // PLL Selection (4x clock multiplier)
#pragma config CFGPLLEN = OFF // PLL Enable Configuration bit (PLL Disabled (firmware controlled))
#pragma config CPUDIV = NOCLKDIV// CPU System Clock Postscaler (CPU uses system clock (no divide))
#pragma config LS48MHZ = SYS24X4// Low Speed USB mode with 48 MHz system clock (System clock at 24 MHz, USB clock divider is set to 4)
// CONFIG1H
#pragma config FOSC = HSH // Oscillator Selection (HS oscillator, high power 16MHz to 25MHz)
#pragma config PCLKEN = ON // Primary Oscillator Shutdown (Primary oscillator enabled)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF // Internal/External Oscillator Switchover (Oscillator Switchover mode disabled)
// CONFIG2L
#pragma config nPWRTEN = ON // Power-up Timer Enable (Power up timer enabled)
#pragma config BOREN = SBORDIS // Brown-out Reset Enable (BOR enabled in hardware (SBOREN is ignored))
#pragma config BORV = 190 // Brown-out Reset Voltage (BOR set to 1.9V nominal)
#pragma config nLPBOR = OFF // Low-Power Brown-out Reset (Low-Power Brown-out Reset disabled)
// CONFIG2H
#pragma config WDTEN = OFF // Watchdog Timer Enable bits (WDT disabled in hardware (SWDTEN ignored))
#pragma config WDTPS = 32768 // Watchdog Timer Postscaler (1:32768)
// CONFIG3H
#pragma config CCP2MX = RC1 // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
#pragma config PBADEN = OFF // PORTB A/D Enable bit (PORTB<5:0> pins are configured as digital I/O on Reset)
#pragma config T3CMX = RC0 // Timer3 Clock Input MUX bit (T3CKI function is on RC0)
#pragma config SDOMX = RB3 // SDO Output MUX bit (SDO function is on RB3)
#pragma config MCLRE = ON // Master Clear Reset Pin Enable (MCLR pin enabled; RE3 input disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset (Stack full/underflow will cause Reset)
#pragma config LVP = ON // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled if MCLRE is also 1)
#pragma config ICPRT = OFF // Dedicated In-Circuit Debug/Programming Port Enable (ICPORT disabled)
#pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled)
// CONFIG5L
#pragma config CP0 = OFF // Block 0 Code Protect (Block 0 is not code-protected)
#pragma config CP1 = OFF // Block 1 Code Protect (Block 1 is not code-protected)
#pragma config CP2 = OFF // Block 2 Code Protect (Block 2 is not code-protected)
#pragma config CP3 = OFF // Block 3 Code Protect (Block 3 is not code-protected)
// CONFIG5H
#pragma config CPB = OFF // Boot Block Code Protect (Boot block is not code-protected)
#pragma config CPD = OFF // Data EEPROM Code Protect (Data EEPROM is not code-protected)
// CONFIG6L
#pragma config WRT0 = OFF // Block 0 Write Protect (Block 0 (0800-1FFFh) is not write-protected)
#pragma config WRT1 = OFF // Block 1 Write Protect (Block 1 (2000-3FFFh) is not write-protected)
#pragma config WRT2 = OFF // Block 2 Write Protect (Block 2 (04000-5FFFh) is not write-protected)
#pragma config WRT3 = OFF // Block 3 Write Protect (Block 3 (06000-7FFFh) is not write-protected)
// CONFIG6H
#pragma config WRTC = OFF // Configuration Registers Write Protect (Configuration registers (300000-3000FFh) are not write-protected)
#pragma config WRTB = OFF // Boot Block Write Protect (Boot block (0000-7FFh) is not write-protected)
#pragma config WRTD = OFF // Data EEPROM Write Protect (Data EEPROM is not write-protected)
// CONFIG7L
#pragma config EBTR0 = OFF // Block 0 Table Read Protect (Block 0 is not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF // Block 1 Table Read Protect (Block 1 is not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF // Block 2 Table Read Protect (Block 2 is not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF // Block 3 Table Read Protect (Block 3 is not protected from table reads executed in other blocks)
// CONFIG7H
#pragma config EBTRB = OFF // Boot Block Table Read Protect (Boot block is not protected from table reads executed in other blocks)
如有任何帮助，我们将不胜感激。
结果果然如我所料，其中一个配置标志是错误的。更改 FOSC 的设置解决了这个问题。新行是：
#pragma config FOSC = INTOSCIO // Oscillator Selection (Internal oscillator)
作为 PIC 编程的新手，我不确定它期望的外部振荡器是什么，但不知何故它最终成为了我。
如果它能正常工作，板上可能有一个外部振荡器，您必须 select 为它设置了错误的增益设置。这是相同的设置，但是如果您 select 例如 XT 用于需要 HS 的振荡器，那么它将是边缘的并且只有在您触摸它时才开始工作，并且这样做会改变负载电容。