ST10F276 - not entering in PowerDown

[serg]

Posted on June 15, 2005 at 11:11

ST10F276 - not entering in PowerDown

[serg]

Posted on June 08, 2005 at 10:55

Description of problem.

I'm trying to enter to PowerDown mode for ST10F276, ver.CAA based controller. To do it I disable internal voltage regulator & RTC. Procedure of PowerDown executed from XRAM (see F276BX_ER_V12.pdf, PWRDN.2).

Execution of test program was stopped, pins of address bus goes to floating state. Supply current fall from ~30mA to 20mA, instead of appr. 1 mA.

Why PowerDown current is too high?

Compiler - Tasking Tools for C166/ST10 v7.5r2 Selected processor C167CR.

example of code:

------------------------

[...]

// Entering in PowerDown procedure -

// executing from XRAM

static void sleepoff(void)

{

(*((volatile unsigned int*)0xED00)) |= 0x380; // RTCCON bit RTCOFF & OFF32

enabled - stop RTC

(*((unsigned int *)0xeb46)) = (*((unsigned int *)0xeb46)) | 0x8; // enable

bit vregoff

#pragma asm

NOP

NOP

PWRDN

NOP

NOP

SRST

#pragma endasm

} /* sleepoff */

// Initialisation proicedure - exec before EINIT, as defined in project

void myInit(void)

{

BUSCON0 = 0; // forced clearing BUSCON - disable external bus

(*((volatile unsigned int*)0x12)) |= 0x400; // enable XMISC - for access to

bit vregoff

} /* myInit */

[...]

[serg]

Posted on June 14, 2005 at 10:40

1.

I don't have ST10Freg file

2.

PWDCFG bit have state of default (clear)

3.

Fast interrupts on P2 disabled

Full text programm on attachments

________________

Attachments :

PWD_prgogramm_text.txt : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0LL&d=%2Fa%2F0X0000000bXh%2FQpgW5Iqh_.PtEorRcsBlxbo9MIRX8YImHbDct5GoBgs&asPdf=false

[serg]

Posted on June 15, 2005 at 07:14

4.

NMI - high state

[najoua]

Posted on June 15, 2005 at 11:11

Hello,

Find attached a header file for the ST10F

Power down mode on the C167CR and the ST10F276 are entered in the same way by executing the PWRDN instruction while the NMI (Non Maskable Interrupt) pin is externally pulled LOW and NOT high otherwise the instruction has no effect.

On the ST10F276, according to the bit PWDCFG, the device will enter either in Protected Power Down mode or in Interruptible power down mode(refer to the ducumentation for more details).

On the C167CR, only one power down mode is available.

Regards,

[ This message was edited by: Najoua on 15-06-2005 15:28 ]

[ This message was edited by: Najoua on 15-06-2005 17:08 ]

________________

Attachments :

reg276.h : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0D3&d=%2Fa%2F0X0000000bXf%2F7mWM8G1V_M6566VLt.SI2Z9IGiOMCQuIf60DQDcVdMY&asPdf=false