896/411 Processor information

American Delco GM ECUs and PCMs, ALDL, OBD 1.5.
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GMWiseGuy
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cars: '02 Silverado/LM7/4L60E/6" Skyjacker

896/411 Processor information

Post by GMWiseGuy »

I know I'm beating a dead horse with this.. But I have 3-411's and 4-896's to play with.. To death :shock:

I'm looking for either another mpu part number, to find a datasheet or a datasheet with pinouts for this processor that I have searched day and night for. Found a few that were close, based off of vss/vdd pins, but no match. Here's the numbers off of the chip that's in all my weird boxes:

185
16246295
1H42C
YQQJJ9940D

(160 pins / Pin 1 lower left hand corner)

I've found a few posts with the same information, some claiming that it's a MC68332. 68332 is not 160 pins. 68336/68376 is 160 pins but does not match up. Some random chip I found MC68341FT is very close but not.. I'm hoping someone has some sort of information I'm missing to locate a pinout. Or a datasheet supplied :lol:

I'm hoping to give the BDM interface a try with BD32 and hopefully a DIY LPT to BDM cable. Ultimately to have one or two pcms with a built in debugger via external usb port. Routing supposed bdm lines through unused and cut C1/C2 Blue/Red did not boot at all.. No sir.

This guy looks promising
http://www.usbjtag.com/jtagnt/ecu411/index.php
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antus
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Re: 896/411 Processor information

Post by antus »

Its custom silicon that includes the 68332 processor and other hardware. You can treat it as 68k code but you wont find a documented chip that matches the pin count and functions. The image maps from 0000000 up and the reset vector is the second 32bit word from the bottom.

That BDM stuff looks good. I have a usbbdmnt here but never quite got it quite working properly. This was some years ago and the docs didnt include the pull up resistor then, so those instructions look about right now.

I dont think you'll be able to debug unless that also freezes the watchdog timer. I dont know if that timer triggers from cpu clocks or something else... Suspect something else as its meant to be independent. If its not paused with the cpu it'll cause a reset when you freeze.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
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