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Infinieon XC Series: Change of ADDRSEL-Registers after EINIT

Hello,

is there a possibility to change the ADDRSEL1-Register after the EINIT-instruction on Infineon XC16X controllers?
Perhaps with changing the Security Level?
I've tried the following sequence to change the security-level to 0x00 (unprotected mode) but without success.
SCUSLC = 0xAAAA; Command 0, state should change to 0x01, but does not.
SCUSLC = 0x5554; Command 1
SCUSLC = 0x0195; Command 2, password = 0x00; 0x96+0xFF (password invertet) = 0x0195
SCUSLC = 0x0000; Command 3, should: new level = 00, no change of the password (default: 0x00).
Who has any ideas concerning these topics??
Thank you very much
Greetings
Toby

Parents

0 Stefan Fricke over 21 years ago

Hi Toby,

you should not invert 0x96,but the 0x00,
so it should be 0x96FF.

Sample:

SCUSLC = 0xAAAA;     // required command 1
SCUSLC = 0x5554;     // required command 2
SCUSLC = 0x96FF;     // 0x96 required +
                     // inverse password to
		     //  unlock; After
                     // Reset this is
                     // default 0x00
	             // inverse 0xFF ->096FFh
SCUSLC = 0;
//  sequence:
//  000b + new level + 000b + new password
//  00 = unprotected   new pw = 00


FOCON  = 0x80;       // Clockout signal ist
                     // visible on P3.15

PLLCON = 0x7889;     // Select 20MHz (@8 MHz
                     //crystal) CPU frequency

_nop_ ();            // terminate EXTR
                     // sequence to make
                     // sure that the
                     // following
                     // instructions get an
                     // own uninterruptable
                     // EXTR #4 sequence
SCUSLC = 0xAAAA;     // Set CPU security
                     //level to protected mode
SCUSLC = 0x5554;
SCUSLC = 0x96FF;
SCUSLC = 0x1800;
// 000b + new level + 000b + new password
// 000 0 000 1 1000 0000 0000  = 0x01800h
//	     1 1 = level -> write protected

Hope this helps,
Stefan

Reply

0 Stefan Fricke over 21 years ago

Hi Toby,

you should not invert 0x96,but the 0x00,
so it should be 0x96FF.

Sample:

SCUSLC = 0xAAAA;     // required command 1
SCUSLC = 0x5554;     // required command 2
SCUSLC = 0x96FF;     // 0x96 required +
                     // inverse password to
		     //  unlock; After
                     // Reset this is
                     // default 0x00
	             // inverse 0xFF ->096FFh
SCUSLC = 0;
//  sequence:
//  000b + new level + 000b + new password
//  00 = unprotected   new pw = 00


FOCON  = 0x80;       // Clockout signal ist
                     // visible on P3.15

PLLCON = 0x7889;     // Select 20MHz (@8 MHz
                     //crystal) CPU frequency

_nop_ ();            // terminate EXTR
                     // sequence to make
                     // sure that the
                     // following
                     // instructions get an
                     // own uninterruptable
                     // EXTR #4 sequence
SCUSLC = 0xAAAA;     // Set CPU security
                     //level to protected mode
SCUSLC = 0x5554;
SCUSLC = 0x96FF;
SCUSLC = 0x1800;
// 000b + new level + 000b + new password
// 000 0 000 1 1000 0000 0000  = 0x01800h
//	     1 1 = level -> write protected

Hope this helps,
Stefan

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