LM555 in Automotive application

Started by K.P.Venu in 68HC1215 years ago 12 replies

Hi All, I want to add a 100Hz external reference clock to my HC12 hardware (D60A).I am planning to use SG555 or LM555 as a 100Hz...

Hi All, I want to add a 100Hz external reference clock to my HC12 hardware (D60A).I am planning to use SG555 or LM555 as a 100Hz square wave generator. Is there anybody using LM555 in automotive application? Is it advicable to use this chip in automotive environment


D60A and CAN sending of long messages

Started by scuthbertf in 68HC1214 years ago

I have a pair of CAN interrupt routines that transmit and receive standard, 8 bytes of data messages. I send a message, do a small...

I have a pair of CAN interrupt routines that transmit and receive standard, 8 bytes of data messages. I send a message, do a small wait loop, then send another message. Both are received exactly as sent from one board to another, and work the same in loop-back mode. I noticed tha


D60A Bootloader

Started by bitjockey1 in 68HC1214 years ago 2 replies

Hello All, I have written a bootloader for the hc12d60a based on Gordon D's app note. What I want to do is force the addresses...

Hello All, I have written a bootloader for the hc12d60a based on Gordon D's app note. What I want to do is force the addresses in the secondary jump table and point the original vectors to the secondary ones. My question is in CW how do I force the address of the secondary jump


Return from BDM lockout under program control

Started by Oliver Betz in 68HC1215 years ago

Hello all, has anybody successfully tried the BDM lockout option of a D60A or a D*128A, especially regarding the way back to...

Hello all, has anybody successfully tried the BDM lockout option of a D60A or a D*128A, especially regarding the way back to "unlocked" state under single chip (!) program control? How does a "locked" controller behave when reset in "special s


Bad: TOF cleared by TCNT access with TFFCA set (D60A)

Started by Oliver Betz in 68HC1214 years ago 2 replies

Hello All, another HC12D60A TFFCA problem: the main timer interrupt flag TOF is cleared on any access to TCNT. IMHO...

Hello All, another HC12D60A TFFCA problem: the main timer interrupt flag TOF is cleared on any access to TCNT. IMHO that's a very bad idea, because TCNT is needed to calculate output compare times. Therefore TOF will be cleared inadvertently. And what's t