Posted on June 08, 2005 at 10:55Description 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 */
[...]
