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HCS12 Full In-Circuit
Emulators & BDM
Embedded Development Tools
Nohau brand embedded systems tools since 1994
Full-Emulator & BDM
Nohau HCS12 Derivatives
with Both Full-Emulator &
BDM Support
HCS12 ‘A’ Family HCS12 ‘D’ Family
MC9S12 A512,
MC9S12 DP512,
A256, A128 & A64 DJ512, DT512, DP256,
DT256,
HCS12 ‘B’ Family DJ256,DG256, DT128,
MC9S12 B256,
DJ128, DG128, DB128,
B128 & B64
DJ64, D64, D32
HCS12 ‘E’ Family
MC9S12 E256,
E128, E64 & E32
HCS12 ‘C’ Family MC9SX A,B,C,D,E, F
MC9S12 C128, C96, - More on the way
C64 & C32
HCS12 ‘T’ Family
MC9S12 T64
HCS12 ‘H’ Family
MC9S12 H256,
H128
Important Debug Features
available only from Nohau
• Extensive support and Trace recording of all the
HCS12 Operating Conditions including:
Going through and out of Reset, COP Watchdog
Reset, STOP & WAIT Power-Down modes, Clock
Loss Limp-Home mode, and full PLL use including
frequent speed-changes
• Full-Speed 25MHz operation at both 5V and 3.3V
• The emulator works in practice to 32MHz bus
speed – this means rock solid operation at the
specified maximum 25MHz bus speed.
More Important Features
available only from Nohau
• Full CMOS levels Port Replacement Unit –
Like the HCS12 silicon - at both 5V and 3.3V
• Fast and Flexible Flex-Cable target adapters
allow escaping from targets at any of 4
directions
• The very intuitive Seehau GUI is easy to get
started with, yet powerful and includes all
the advanced debug features
Question:
What is the WORST thing
that can happen to an
Emulator when the COP
Watchdog fires up ?
Answer:
The Emulator hangs up and
doesn’t show a clue why a
COP Timeout occurred.
COP Watchdog Example
• The COP Watchdog is enabled, and is
not periodically serviced, so Reset will
occur.
• Every time a COP Watchdog Reset
occurs a counter is incremented.
• Then the program wait for the next
COP Watchdog Reset.
• The Trace records all the sequence.
Emulator Operation through
STOP & WAIT
Power-Down Modes
Power Down Algorithm
8MHz
EXTERNAL
INTERRUPT
WAKE UP
COUNTER = 0
8MHz
8MHz
PROGRAM
PLL
& TURN ON
COUNTER =
COUNTER + 1
32MHz
8MHz
ENTER
0MHz
STOP
POWER DOWN
32MHz
TURN
PLL ON
Power-Downs Summary
• Our Emulator Can Handle going into
and out of STOP Power Down mode.
• WAIT Power Down Mode is handled
similarly.
• There are 3 sub cases of WAIT and 2
sub cases of STOP. All are handled by
the emulator equally well.
• The Trace records the entire Power
Down and Wake-Up sequence.
Limp-Home
Self-Clock Mode
When external frequency is not
fed to the CPU for some reason,
the CPU enters Limp-Home mode.
In this mode it generates
internally a low undetermined
frequency to allow itself to
recover from the clock loss.
Limp-Home
Self-Clock Mode
The Nohau Emulator allows the CPU to go
through Limp-Home Mode
(with the emulator keeping track of things).
To allow this, the MISC register must be set
to 0 Wait-States and NO ECLK stretch on
the external bus.
Limp-Home Example
• We will use the Timer Program
• Start at 8MHz bus speed with the clock
running at Normal rate.
• Switch manually to select the PLL from the
user interface, while the Timer program is
running. This will change to 32MHz bus
speed.
• Pull the EXTAL jumper to force Limp-Home
Mode. We will observe the speed dropping,
to about 4MHz bus speed.
Limp-Home Mode Summary
The Emulator keeps working through
Limp-Home Mode.
• A write from the user interface to a
register without stopping the code
from running.
• Observe changes to registers as they
happen during code execution.
Speed Changes
• Speed Changes pose a challenge for an
Emulator System, for several reasons:
• The BDM Communication rate changes with
the speed, and so the emulator should
adjust its communication rate accordingly
to allow continued uninterrupted
communication.
• The emulator logic should adjust as
appropriate for low speed or high speed
operation when the speed changes.
Speed Changes
The Nohau HCS12 Emulator excels in
handling Speed-Changes
• The Emulator Detects Speed-Changes
automatically.
• It adjusts the BDM communication rate
automatically, to sustain continued uninterrupted BDM communication.
• It adjusts the FPGA equations and timing
automatically, as appropriate for low-speed
and high-speed operation.
Speed Changes Example
8.25MHz
PLL OFF COUNTER = 0
PLL ON COUNTER = 0
8.25MHz
PROGRAM PLL FOR
MULTIPLY BY 4
8.25MHz
WAIT FOR
PLL TO LOCK
8.25MHz
8.25MHz
SELECT PLL
33MHz
PLL ON COUNTER =
PLL ON COUNER + 1
33MHz
DESELECT PLL
8.25MHz
PLL OFF COUNTER =
PLL OFF COUNER + 1
8.25MHz
Speed Changes Summary
• The program changes speeds at a very high
rate – 250 thousand times every second.
• During every serial BDM BYTE Read
command, the speed changes 20 times.
And yet:
• Uninterrupted BDM communication is
sustained.
• The emulator keeps functioning and
adjusting its timing through all these
changes.
HCS12 Emulator Components
Escaping From the Target at
Any of 4 Directions
The Intuitive
Seehau User-Interface
Full Emulator Advantages
as compared to a BDM
• Sophisticated Hardware Trace – 131,000 Frames –
Instructions + Data + Time Stamp + More
• Sophisticated Triggers and Filter
• Unlimited number of breakpoints – Hardware & Software
• Extensive support for Reset & COP Watchdog Reset cycling
• Extensive support for Power-Downs cycling
• Limp-Home Clock-Loss Debug support
• Full support for Speed Changes
• Flexible Emulation RAM can replace Flash and EEPROM
• Entirely non-intrusive Shadow memory - always available
• Debug applications that must not stop during debugging
• Debug code before a target is available
• Large Emulation RAM allows code development
for future larger Derivatives (E256, Etc.)
• Code Coverage and Performance Analysis
Motorola People Say about
the Nohau HCS12 Emulator:
“It is an excellent tool. I am very impressed indeed. The
package is comprehensive, and I am satisfied that this is a
robust evaluation solution. I found the Seehau software very
easy to use. You have obviously put a lot of development time
into this. I was able to get up and tracing in a matter of half
an hour after opening the box. The software is extremely
intuitive, but will satisfy the advanced user. Good work! The
USB interface is great. The emulator POD construction is
good - I really like the modular concept of daughtercards.
From what I have seen I 100% believe that this tool is well
designed, well thought out and easy to use. I would be happy
to recommend this unit to our mutual customers as an
excellent development tool for our HCS12 devices.”
Grant More, FAE, 8/16 Bit Products Division, EMEA Transportation
& Standard Products Group, East Kilbride, Scotland
Motorola People Say about
the Nohau HCS12 Emulator:
“I think that this Emulator is great. I could start using it
since the first day I had it, especially because of the Getting
Started Guide, which is helpful for making the first tests.
The Hardware is robust (at least what I have tested) and
with a lot of capabilities. I have been working with some of its
modules like the DAC, PWM, PFM, SCI, Timers, and all of
them have worked perfectly. The Seehau utility is excellent
for debugging, specially for the breakpoints and the Shadow
Memory which is excellent and improves incredibly the design
and debug of a program. Also the description and manipulation
of registers in a separate window is very helpful. I think that
this could be an excellent tool for developing new application
with the HCS12E128 microcontroller and it improve greatly
the design and debug times.”
Luis Reynoso, FAE, Motorola SPS, LAC North, Guadalajara Mexico
Motorola People Say about
the Nohau HCS12 Emulator:
“Development support from companies such as
Nohau is critical to the success of our HCS12
family. Not only does Nohau provide an excellent
intuitive development environment for our
HCS12 microcontroller products, but they also
have great international presence to support
newly developing regions.”
Kevin Kilbane
Strategic Marketing Manager
Motorola’s 8/16 Bit Products Division
Austin Texas.
Contact Us
• URL
• Email
www.icetech.com
[email protected]
• Voice USA
800.68.NOHAU – 800.686.6428
• Voice International 650.375.0409
• FAX
650.375.8666
• US Gov. Contractor
CAGE Code 4CNU6 - SIC 3825 - NAICS 334515
• ICE Technology
422 Peninsula Avenue
San Mateo CA, 94401
Providing Nohau emulators since 1994