I am using MC9S08DZ96 microcontroller with 8MHz external clock. I have read Freescale AN3387 (HCS08 Automotive Low-Power Modes) and I have tried to change some of registers.
When the timer value reaches a certain value, the stop mode is executed and I expect the microcontroller to go to stop3.
These are my registers:
void _EntryPoint(void)
{
/* ### MC9S08DZ128_64 "Cpu" init code ... */
/* PE initialization code after reset */
/* Common initialization of the write once registers */
/* SOPT1: COPT=0,STOPE=1,SCI2PS=0,IIC1PS=0,??=0,??=0,??=0 */
setReg8(SOPT1, 0x20U);
/* SOPT2: COPCLKS=0,COPW=0,??=0,ADHTS=0,??=0,MCSEL=0 */
setReg8(SOPT2, 0x00U);
/* SPMSC1: LVWF=0,LVWACK=0,LVWIE=0,LVDRE=1,LVDSE=1,LVDE=1,??=0,BGBE=0 */
setReg8(SPMSC1, 0x1CU);
/* SPMSC2: ??=0,??=0,LVDV=0,LVWV=0,PPDF=0,PPDACK=0,??=0,PPDC=0 */
setReg8(SPMSC2, 0x00U);
/* System clock initialization */
/*lint -save -e923 Disable MISRA rule (11.3) checking. */
if (*(uint8_t*)0xFFAFU != 0xFFU) { /* Test if the device trim value is stored on the specified address */
MCGTRM = *(uint8_t*)0xFFAFU; /* Initialize MCGTRM register from a non volatile memory */
enter code here
MCGSC = *(uint8_t*)0xFFAEU; /* Initialize MCGSC register from a non volatile memory */
}
/*lint -restore Enable MISRA rule (11.3) checking. */
/* MCGC2: BDIV=0,RANGE=1,HGO=0,LP=0,EREFS=0,ERCLKEN=1,EREFSTEN=1 */
setReg8(MCGC2, 0x23U); /* Set MCGC2 register */
/* MCGC3: DIV32=1 */
setReg8Bits(MCGC3, 0x10U);
/* MCGC1: CLKS=2,RDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=1 */
setReg8(MCGC1, 0x9BU); /* Set MCGC1 register */
/* MCGC3: LOLIE=0,PLLS=0,CME=0,DIV32=1,VDIV=4 */
setReg8(MCGC3, 0x14U); /* Set MCGC3 register */
/* MCGT: ??=0,??=0,DMX32=0,??=0,??=0,??=0,??=0,DRST_DRS=0 */
setReg8(MCGT, 0x00U); /* Set MCGT register */
while(MCGSC_IREFST != 0U) { /* Wait until external reference is selected */
}
while((MCGSC & 0x0CU) != 0x08U) { /* Wait until external clock is selected as a bus clock reference */
}
/* MCGC2: BDIV=0,RANGE=1,HGO=0,LP=1,EREFS=0,ERCLKEN=1,EREFSTEN=1 */
setReg8(MCGC2, 0x2BU); /* Set MCGC2 register */
/* MCGC1: CLKS=2,RDIV=2,IREFS=0,IRCLKEN=1,IREFSTEN=1 */
setReg8(MCGC1, 0x93U); /* Set MCGC1 register */
/* MCGC3: DIV32=0 */
clrReg8Bits(MCGC3, 0x10U);
/* MCGC3: LOLIE=0,PLLS=1,CME=0,DIV32=0,VDIV=4 */
setReg8(MCGC3, 0x44U); /* Set MCGC3 register */
while(MCGSC_PLLST == 0U) { /* Wait until PLL is selected */
}
/* MCGC2: LP=0 */
clrReg8Bits(MCGC2, 0x08U);
while(MCGSC_LOCK == 0U) { /* Wait until PLL is locked */
}
/* MCGC1: CLKS=0,RDIV=2,IREFS=0,IRCLKEN=1,IREFSTEN=1 */
setReg8(MCGC1, 0x13U); /* Set MCGC1 register */
while((MCGSC & 0x0CU) != 0x0CU) { /* Wait until PLL clock is selected as a bus clock reference */
}
/*** End of PE initialization code after reset ***/
/*lint -save -e950 Disable MISRA rule (1.1) checking. */
__asm jmp _Startup ; /* Jump to C startup code */
/*lint -restore Enable MISRA rule (1.1) checking. */
}
When the timer value reaches a certain value, I wrote asm stop; command,
but I don't see any change that the power consumption has decreased. In fact, I expect the device's consumption to reach microamps after the stop command, instead of the usual 30mA. Does anyone have experience doing this?
