TECHNICAL NOTES ON THE EEC-IV MCU - Auto diagnostics

Figure: 8061 Microprocessor
Figure: 8061 Major Functional Units
Technical Notes on The EEC-IV MCU
HARDWARE
Compiled by Tom Cloud
(font is Courier New)
THE MICROPROCESSOR / MEMORY CHIP SET:
Eectch98-Part1.fm
The micro-controller is an Intel 8061, a close cousin to the Intel 8096. It is supplied
by three manufacturers: Intel, Toshiba (6127) and Motorola, though the
Motorola units are said to
slip spec a little and dif-
fer in their timing
slightly from the others.
It was originally (in 1978)
intended to operate in conjunction
with an 8361 ROM.
There are some major differences
between the 8061
and 8096 (e.g. pinouts, bus
layout, etc.), but most of
the code appears
transferable.
It is organized internally
as a 16-bit machine with a
double bus structure consisting
of CPU, memory
controller, clock generator,
I/O and co-processors,
A/D converter, watchdog
timer and interrupt
controller.
The high speed hardware / register structure is a design by Ford engineers to simplify
the processing of digital I/O signals. Ford chose to design a custom
microprocessor - memory combination
and the 8061 and
8361 were the result. Those
two chips form a two-chip
microcomputer.
There were several design
goals for this custom
microprocessor:
C
T
R
L
&
I
/
O
I
N
T
E
R
F
A
C
E
1. An I/O intensive
circuit with hi-speed
digital I/O capability.
2. A fast, on-chip, multichannel
A/D converter.
3. Hardware multiply and
divide.
4. Multi-level,
XTAL
ANALOG
INPUTS
13
HI SPEED
INPUTS
8
HI SPEED
OUTPUTS
10
LO SPEED
OUTPUTS
8
BIDIRECT
I/O
2
A/D
CONVERTER
HSI
HSO
I
/
O
C
I
R
C
U
I
T
S
WATCHDOG
TIMER
INTERRUPT
CONTROLLER
INTERRUPT
CONTROLLER,
WATCHDOG
TIMER, I/O
STATUS
REGISTER
XTAL
D-BUS A-BUS
REGISTER
ALU
REGISTER
FILE
8061 Major Functional Units
MEMORY
CONTROLLER
EEC-IV Technical Notes: Hardware 7 last edited: 9/29/98
16
CONTROL PROCESSOR
INSTRUCTION
REGISTER
ADDR A-BUS 8
ADDR DATA
DATA
DATA D-BUS (16)
8061
MICROPROCESSOR
CLOCK
GENERATION
CPU
OPCODE
RALU
PROGRAM
COUNTER
ADDR
DATA DATA
REGISTER
FILE
(120 X 16)
8
STACK
POINTER
8
LSBs
M B
B U
U F
S F
ADDR/
DATA
B
U
F
F
MBUS
MB0-MB7
M BUS