J
John Dyer
Guest
I'm working on an engine management controller from an early 90's car,
(Mazda MS-6) which
uses an ECU made by Nippon Denso. Most of the technology is easily
identifiable due to its
age, unlike more modern units.
This unit is based around Motorola chips, including a 6821 pia and a 6840
timer. The cpu
is a Motorola special, type SC402617FN and obviously made for Denso as it
has their
logo on it.
Looking at the firmware shows that its based around a 68HC11 core, but which
one?
The package is an 84 pin plcc.
I would very much like to at least identify the pinouts and extra on-board
functions
of the chip so if anyone can assist I would be most grateful.
This is a project I am working on to try and understand how the cpu can keep
track
of sequential fuel injection at high speeds while attending to all the
multitudinous tasks
it has to monitor.
Thanks,
John Dyer
(Mazda MS-6) which
uses an ECU made by Nippon Denso. Most of the technology is easily
identifiable due to its
age, unlike more modern units.
This unit is based around Motorola chips, including a 6821 pia and a 6840
timer. The cpu
is a Motorola special, type SC402617FN and obviously made for Denso as it
has their
logo on it.
Looking at the firmware shows that its based around a 68HC11 core, but which
one?
The package is an 84 pin plcc.
I would very much like to at least identify the pinouts and extra on-board
functions
of the chip so if anyone can assist I would be most grateful.
This is a project I am working on to try and understand how the cpu can keep
track
of sequential fuel injection at high speeds while attending to all the
multitudinous tasks
it has to monitor.
Thanks,
John Dyer