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Post Info TOPIC: BDM Connections for 68HC916 processors


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BDM Connections for 68HC916 processors

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.


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


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


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.


/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


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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