topic Re: How to put s08 Microcontroller in sleep mode(stop3) and wakeup it? in 8-bit Microcontrollers

How to put s08 Microcontroller in sleep mode(stop3) and wakeup it?

mehdializadeh — Tue, 31 Jan 2023 12:01:29 GMT

Hi,
I am using mc9s08dz96 microcontroller with 8 MHz external clock osc. I have read This document and I have try to write a function, When the timer value reaches a certain value, the function is executed and I expect the microcontroller to go to stop3.
First I try to set this register:

void stop3(){ setReg8(SPMSC1, 0x14U); setReg8(SPMSC2, 0x00U); setReg8(SOPT1, 0x23U); setReg8(MCGC1, 0x04U); setReg8(MCGC2, 0x26U); }

With this function, the power consumption did not decrease. I tried to set the registers in more detail with the help of datasheet .

void stop3(){ MCGC1_IRCLKEN = 1; SPMSC1_LVDSE = 1; SPMSC1_LVDE = 1; SOPT1_STOPE = 1; SPMSC2_PPDC = 0; SPMSC1_LVDRE = 1; SPMSC1_LVWACK = 1; SOPT1_STOPE = 1; MCGC1_IREFS = 1; MCGC2_ERCLKEN = 1; MCGC2_EREFS = 1; MCGC2_HGO = 1; MCGC2_RANGE = 1; }

But this code didn't work either. Does anyone have experience doing this?
Thank you in advance.

Re: How to put s08 Microcontroller in sleep mode(stop3) and wakeup it?

vicentegomez — Tue, 31 Jan 2023 22:40:05 GMT

To enter stop mode(stop2,stop3),just use the following instruction:

_asm stop;

You can place these to instruction at wherever you want.

The stop mode configuration is determined by SOPT1:STOPE ,this bit should be enabled to enable stop mode SPMSC2:PPDC,configure to enter stop2 or stop3

Notice:If you want to enter stop2,you should disable the LVD or you will enter stop3.After wake up from stop2,you shold clear the PPDF by write a one to PPDACK.

Re: How to put s08 Microcontroller in sleep mode(stop3) and wakeup it?

mehdializadeh — Wed, 01 Feb 2023 12:50:57 GMT

Thanks a lot for your reply,

I set this register:

void _EntryPoint(void) { setReg8(SOPT1, 0x20U); setReg8(SOPT2, 0x00U); setReg8(SPMSC1, 0x1CU); setReg8(SPMSC2, 0x00U); if (*(uint8_t*)0xFFAFU != 0xFFU) { MCGTRM = *(uint8_t*)0xFFAFU; MCGSC = *(uint8_t*)0xFFAEU; } setReg8(MCGC2, 0x26U); setReg8Bits(MCGC3, 0x10U); setReg8(MCGC1, 0x9AU); setReg8(MCGC3, 0x14U); setReg8(MCGT, 0x00U); while(MCGSC_OSCINIT == 0U) { } while(MCGSC_IREFST != 0U) { } while((MCGSC & 0x0CU) != 0x08U) { } setReg8(MCGC2, 0x2EU); setReg8(MCGC1, 0x92U); clrReg8Bits(MCGC3, 0x10U); setReg8(MCGC3, 0x44U); while(MCGSC_PLLST == 0U) { } clrReg8Bits(MCGC2, 0x08U); while(MCGSC_LOCK == 0U) { } setReg8(MCGC1, 0x12U); while((MCGSC & 0x0CU) != 0x0CU) { } __asm jmp _Startup ; }

But the command "__asm stop;" in main(), has no effects. The project file is attached.
Thank you