NEC V850: Things to note after powering on the system-EEWORLD

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Compilation environment: IAR For V850 3.81 + MiniCube2

Hardware environment: D70F3630 (D70F3377A)

At the beginning, I encountered many problems, mainly because I was not familiar with the hardware structure.

The first problem is that the hardware simulation can proceed normally, but after the hex file is generated and downloaded to the target development board, the system will reset inexplicably.

I was troubled by this problem for 3 days, and finally found out that it was because OptionBytes was not set. This OptionBytes is used to set some clock selection and frequency multiplication information, so it must be added, and the watchdog timer must be disabled at the beginning of the main function. There is an option.s85 file in the code generated by Applilet2 for V850ESFx3. As long as you include this assembly file in your project, you can set OptionBytes.

;****************************************************** ******************************
;* Global define
;********************** *************************************************** **********
#define CG_OPTION7A 0x00
#define CG_OPTION7B 0x80
#define OPT7C 0x00
#define OPT7D 0x00
#define OPT7E 0x00
#define OPT7F 0x00

;****************** *************************************************** ************
;* This is the default initialization string of the Option Byte(s).
;* For details about valid values and their meaning,
;* please have a look into the device User's manual
;****************************************************** ****************************
COMMON INTVEC:CODE:ROOT(2)
ORG 7AH
`OPTBYTES`:
DB CG_OPTION7A
DB CG_OPTION7B
DB OPT7C
DB OPT7D
DB OPT7E
DB OPT7F
END

void main(void)
{
WDTM2 = 0x1F;

... ...
}

The second problem is that external interrupts do not respond.

This is due to hardware reasons. The buttons on the MCU forgot the pull-up resistor and only had a capacitor to ground, so they were unable to respond to interrupt events.

The buttons connected to the MCU must be equipped with pull-up resistors.

Finally, here is the simplest project list diagram

NEC V850 system power-on precautions - Beans - Code Beans

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