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FAQ

    • .How to select each option in Code Option?

      Different chip declaration and different compiler software versions, Code Option has different options to choose. The option meanings are as follows:

      ◆ Watchdog：
      Always on―watchdog timer always enable；
      Enable―watchdog timer enable in normal mode and slow mode and stops in green and sleep mode.
      Disable―watchdog timer disable。
      ※ Note: When you select Always on option, the system will not enter sleep mode.

      ◆ Reset_Pin：
      Pxx―select internal reset, the pin will be used as input only port;
      Reset―select external reset；
      ※ Note: When you select internal reset, Pxx port is input only pin and without internal pull-up resistor.

      ◆ High_Clk：
      IHRC_16M―High speed internal 16MHz RC oscillator;
      Ext_RC―external RC oscillator；
      32K_X'tal―external low-frequency crystal oscillator (such as 32.768KHz)；
      4M_X'tal―external standard quartz oscillator or ceramic oscillator (usually in the 2M ~ 10MHz);
      12M_X'tal―external high speed crystal oscillator or ceramic oscillator (typically 10MHz ~ 16MHz). 。
      ※ Note: IHRC_16M option only appears in high speed internal RC oscillator integrated circuit IC, when you select this option, XIN/XOUT pin will be used as general I/O port.

      ◆ Fcpu：
      Fosc/1―instruction cycle = 1 clock cycle；
      Fosc/2―instruction cycle = 2 clock cycles；
      Fosc/4―instruction cycle= 4 clock cycles；
      Fosc/8―instruction cycle = 8 clock cycles；
      Fosc/16―instruction cycle = 16 clock cycles；
      ※ Note: When you select Noise_Filter Enable or IHRC_16M in Code Option, Fosc/1 and Fosc/2 of Fcpu option will be automatically disabled.

      ◆ Security：
      enable―encrypt program code；
      disable―not encrypt program code.

      ◆ Noise_Filter：
      enable―enable noise filter.
      disable―disable noise filter.
      ※ Note: When you enable noise filter function, which will improve the chip anti disturbance capability, Fosc/1 and Fosc/2 of Fcpu option will be automatically disabled.

      ◆ LVD：
      LVD_L―LVD will reset chip if VDD is below 2.0V.
      LVD_M―LVD will reset chip if VDD is below 2.0V. Enable LVD24 bit of PFLAG register for 2.4V low voltage indicator。
      LVD_H―LVD will reset chip if VDD is below 2.4V. Enable LVD36 bit of PFLAG register for 3.6V low voltage indicator。
      LVD_MAX―LVD will reset chip if VDD is below 3.6V.(only some type have, such as SN8P2522)

    • .How to select in Code Option when using 1M crystal?

      When the selected external oscillator frequency is less than 1MHz, the choice is 32K_X 'tal option, more than 1MHz and less than 10MHz,please choose 4M _X' tal option, 10MHz or more you can choose 12M _X 'tal option. 
      High_Clk option in Code Option only affects oscillator driver and simulation capability, in actual run-time are guided by the connected crystal. Thus, when using 1MHz oscillator, choose 32K_X 'tal option, you can also choose 4M_X' tal option. 

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