topic Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16 in 8-bit Microcontrollers

Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

jonascalifornia — Mon, 03 Mar 2014 08:30:40 GMT

Dear Freescale Community,

When I program my MC9S08PA16 using “standalone flash mode”, and then power up at 3.3V, the MCU will reset when waking from a STOP instruction. This does not happen above 3.4V or below 3.2V, nor does it happen at any voltage in debug mode.

In my design, the MCU wakes from a STOP instruction using either an IRQ interrupt, an RTC interrupt, or a Keyboard interrupt. All show the same issue. I've ensured that the STOPE is set, enabling the STOP functionality. And when I print the reset message I receive an “illegal address” message.

Any thoughts? Thank you for your help.

Jonas

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

deepakrana — Tue, 04 Mar 2014 08:48:14 GMT

hi Jonas

Need the following inputs:

1) Your configuration of the SYS_SOPT1 register

2) Your PMC_SPMSC1 / SPMSC2 registers

3) Also you mention that when you print the reset message, instead of printf statment(if you are using) can you use LED or GPIO toggel to understand the mode switching. Also will like to understand that when you mention how are you printing .

Your are facing problem at one particular level of voltage( above and below works fine) so this peciular.

Thanking you

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

jonascalifornia — Tue, 04 Mar 2014 17:22:16 GMT

Hi Deepak Rana,

SYS_SOPT1 = 0x09;

PMC_SPMSC1 = 0x01;

PMC_SPMSC2 = 0x00;

I am printing using the Tx1 pin, and reading the output on my computer using a USB-UART interface.

I confirmed that the reset message is both ILAD and ILOP using only GPIO toggle.

The width of the problematic voltage is from 3.25 - 3.45V. Above and below works fine.

Thanks,

Jonas

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

deepakrana — Wed, 05 Mar 2014 14:02:15 GMT

this calls for replicaton

will it possible for you to share a test code on which replicated this behaviour

Don't see any errata on this so will replicate and then comment further

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

Wlodek_D_ — Tue, 11 Mar 2014 15:40:23 GMT

Dear Jonas Ketterle,

Thank you for your post, however please consider moving it to the right community place for better visibility.

For details please see general advice https://community.freescale.com/docs/DOC-99909

Thank you for using Freescale Community.

Regards,

Wlodek_D.

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

jonascalifornia — Tue, 11 Mar 2014 19:39:35 GMT

Thank you, I've moved the discussion to the 8-bit Microcontrollers space.

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

jonascalifornia — Tue, 11 Mar 2014 19:49:44 GMT

Hi,

Below is the test code. Please check if you can replicate this behavior. I have a 0.1uF capacitor and a 100k resistor connected in parallel from the IRQ pin to GND. Charging the capacitor and then allowing it to discharge upon entering STOP triggers the IRQ interrupt to wake the MCU at a regular interval.

#include "mc9s08pa16.h"

#include <hidef.h> /* for EnableInterrupts macro */

#include "derivative.h" /* include peripheral declarations */

__interrupt VectorNumber_Virq_wdog void IRQ_isr(void) {

IRQ_SC_IRQACK = 1; // clear interrupt flag

}

void main(void) {

SYS_SOPT1 = 0x09; // 00001001 BKGDPE = 1, RSTPE = 0, STOPE = 1; // this register can only be written once, on reset

SYS_SOPT2 = 0xB0; // 10110000 TXDME = 1, RXDFE = 1, RXDCE = 1 // this register can only be written once, on reset

DisableInterrupts;

PMC_SPMSC1 = 0x01; // this is supposed to be written on startup, even if all zero - enable band gap buffer

PMC_SPMSC2 = 0x00; // this is supposed to be written on startup, even if all zero

NVM_FCLKDIV_FDIV = 0x04; // divide 5MHz down to 1MHz, datasheet setting required to read/write NVM

// Disable Watchdog

WDOG_CNT = 0xC520; // write the 1st unlock word

WDOG_CNT = 0xD928; // write the 2nd unlock word

WDOG_TOVAL = 1000; // setting timeout value

WDOG_CS2 = WDOG_CS2_CLK_MASK; // setting 1-kHz clock source

WDOG_CS1 = WDOG_CS1_EN_MASK; // enable counter running

WDOG_CS1_STOP = 0; // disable Watchdog in stop

WDOG_CS1_UPDATE = 1; // allow sw to disable the watchdog

WDOG_CS1_EN = 0; // disable the Watchdog

// Configure System Clock

ICS_C1 = 0x04; // 00000100 - default settings

ICS_C2_BDIV = 2; // divide bus clock by 4 --> 20MHz/4 = 5Mhz

ICS_C3 = 0x4C; // trim internal reference clock here ... using oscilloscope

// configure output ports

PORT_PTCOE_PTCOE7 = 1; // enable port C7 as output - TxD

PORT_PTAOE_PTAOE5 = 1; // enable port A5 as output - RTI

PORT_PTAD_PTAD5 = 1; // output high on A5 to charge - RTI

// configure UART

SCI1_BDH_SBNS = 0; // 1 stop bit

SCI1_C1_LOOPS = 0; // separate RxD and TxD pins

SCI1_C1_M = 0; // 8 data bits

SCI1_C1_PE = 0; // data parity check enable

SCI1_BD = 8; // baud rate is 5000000/(8*16) = 39062.5, use 40000 in Docklight, 38400 in Bootloader

SCI1_C2_TIE = 1; // transmit interrupt when buffer is empty

SCI1_C2_RIE = 1; // receive interrupt when data is received

SCI1_C2_TE = 1; // enable transmitter

SCI1_C2_RE = 1; // enable receiver

SCI1_C2_TIE = 0; // will get turned on by a message

EnableInterrupts;

for(;;) {

PORT_PTAOE_PTAOE5 = 0; // disable port A5 as output - RTI

RTC_SC1_RTIE = 0; // disable RTC interrupt

IRQ_SC = 0x52; // 01010010, disable pullup, falling edge, enable IRQ pin, clear flag, interrupt enable, edges only

_Stop;

IRQ_SC = 0x00; // disable IRQ

PORT_PTAOE_PTAOE5 = 1; // enable port A5 as output - RTI

PORT_PTAD_PTAD5 = 1; // set port high to charge RTI

}

Thanks! Jonas

Re: Standalone flash mode causes reset when running after STOP only at 3.3V with MC9S08PA16

jonascalifornia — Thu, 27 Mar 2014 18:50:20 GMT

At last ... issue identified. It is a known bug in the Power Management Section of the MCU.

mask set 4N40C, issue e4592:

--> Unstable to wake up MCU from stop3 mode with LVD disabled when the MCU power supply VDD is in the low range.

Workaround ---> Low power stop3 mode cannot be used from 2.7V to 4.2V. High power stop3 mode (both LVDE bit and LVDSE bit set) can still be used in this voltage range.

This issue will be resolved in a future silicon revision.

http://cache.freescale.com/files/microcontrollers/doc/errata/S08PT60_4N40C.pdf?&Parent_nodeId=&Parent_pageType

Thanks all for the help!