Issue the command BRES and register ITC->ISPR

[zheleznjakov]

Posted on January 31, 2011 at 05:04

why

reset command BRES

 

does not

work

one

bit of

the register ITC->ISPR

(

does not reset the

bit

)

in

the simulator

works

in

real

 mcu

does not work

.

-

However,

the command BSET

works

in

the simulator

and in

mcu

---

example (simulator STVD 4.2.0):

// ITC->ISPR6 &= ~(1UL << 6);

0x721D7F75      BRES  0x7f75,&sharp6 // before ITC->ISPR6=0xFF after ITC->ISPR6=0xBF

// ITC->ISPR6 &= ~((1UL << 6) | (1UL << 7));

0xC67F75        LD    A,0x7f75 // before ITC->ISPR6=0xBF

0xA43F          AND   A,&sharp0x3f

0xC77F75        LD    0x7f75,A // after ITC->ISPR6=0x3F

// ITC->ISPR6 |= (1UL << 6);

0x721C7F75      BSET  0x7f75,&sharp6 // before ITC->ISPR6=0x3F after ITC->ISPR6=0x7F

--

MCU STM8L151K6

---

example (real mcu):

// ITC->ISPR6 &= ~(1UL << 6);

0x721D7F75      BRES  0x7f75,&sharp6 // before ITC->ISPR6=0xFF after ITC->ISPR6=0xFF

// ITC->ISPR6 &= ~((1UL << 6) | (1UL << 7));

0xC67F75        LD    A,0x7f75 // before ITC->ISPR6=0xFF

0xA43F          AND   A,&sharp0x3f

0xC77F75        LD    0x7f75,A // after ITC->ISPR6=0x3F

// ITC->ISPR6 |= (1UL << 6);

0x721C7F75      BSET  0x7f75,&sharp6 // before ITC->ISPR6=0x3F after ITC->ISPR6=0x7F

#stm8l151k6

[napoleoni.jacques]

Posted on January 31, 2011 at 10:27

Hello,

It seems that by referring to STM8L15x reference manual, you're not allowed to write the 10 value in VECTxSPR[1:0] (priority level 0) that corresponds to the change of FFh value to BFh value (your comment ''before ITC->ISPR6=0xFF after ITC->ISPR6=0xBF'')

 

In that case, ''the previous value is kept and the interrupt priority remains unchanged''. See Software priority register x (ITC_SPRX) description of Ref Manual.

This feature is perhaps absent from simulator. This issue is then not linked to the behaviour of BRES command.

Regards.

[zheleznjakov]

Posted on January 31, 2011 at 10:57

Thank you very much

.

I

have

realized my mistake.

P/S Sorry

for

my

english :)