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Post Info TOPIC: BDM Connections for 68HC916 processors


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BDM Connections for 68HC916 processors
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Generic Pin Connections

Signal         BDM              160-pin Processor         132-pin Processor

/DS               1                             n/c                                      n/c
/BERR            2                            n/c                                      n/c
GND              3                            GND                                    GND
DSCLK          4                             139                                     69
GND             5                             GND                                    66/GND
FREEZE        6                              79                                       74
/RESET         7                              76                                       71
DSI              8                              140                                     68
VDD             9                               5V                                      63/5V
DS0             10                             141                                    67


Connect 5V and GND to convenient points on the PCB.


Baleno 65G60 
This ECU has an area with no tracking that makes a convenient point to mount a 10-pin BDM header. I used a piece of 0.1" stripboard as a template to drill the holes and the superglued the connector in place before wiring it.


bdm_port_top.jpg


The signals all have test pads that can be wired to, the power supply connections can be soldered either side of the de-coupling capacitor C731.

/DS               1                             n/c
/BERR            2                            n/c
GND              3                            C731-
DSCLK          4                             P872
GND             5                             C731-
FREEZE        6                              P873
/RESET         7                              P805
DSI              8                              P874
VDD             9                               C731+
DS0             10                             P875


bdm_port_back.jpg

Disable watchdog by cutting track between C405 and IC401 then link between the pads after programming.


wdog_mod.jpg



Jimny 81A11 ECU

For this ECU I only needed to attach a header temporarily so I mounted one on a piece of stripboard. There are a couple of wires that must be soldered directly to the processor pins. For this I used a soldering iron with a 0.6mm tip. The watchdog must be disabled as shown above.

bdm_hack.jpg



/DS               1                           via to pin 93
/BERR            2                           R730
GND              3                            P910
DSCLK          4                             R729
GND             5                             P910
FREEZE        6                              Pin 79
/RESET         7                             via near FCCP
DSI              8                             R728 
VDD             9                             C731 
DS0             10                            Pin 141





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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

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