Specifications
35
Subject to change without notice
The soft menu key CONFIGURATION will call a menu which is
dependent upon the bus type selected. These menus are de-
scribed in the chapters of the respective bus congurations.
The menu called by pressing DISPLAY SETUP is the same for
all buses, it allows to select the decoding format. The following
formats are available:
– Binary
– Hexadecimal
– Decimal
– ASCII
Use the soft menu key SINGLE BITS to switch the display of
individual bit lines of the bus display (above the table display)
on or off.
12.1 I
2
Cbus
The I
2
C bus is a two-wire bus (clock and data) which was
developed by Philips and which allows data rates of up to 3.4
Mbits/s.
12.2 I
2
CBusconguration
STOP
TiPP
Remark: prior to conguring the bus, make sure
that you chose the correct logic level (as described
in chapter 11.1).
In order to decode the I
2
C bus, it is only necessar y, when con-
guring the bus, to dene which logic channel carries the clock
and which the data. These settings are performed after the
selection of the bus type I
2
C in the bus menu by subsequently
pressing the soft menu key CONFIGURATION. A menu will
open, select the top soft menu key CLOCK SCL and use the
universal knob to select the appropriate channel. The denition
of the data channel is performed in the same manner after
pressing the soft menu key DATA SDA. For checking these
entries a small window will show the actual settings while in
this submenu.
Fig. 12.3: Menu for the denition of the I
2
C sources.
All menus will close upon pressing the MENU OFF key twice.
Serial bus analysis
Fig. 12.4 I
2
C message, hexadecimal decoded.
Certain portions of the I
2
C messages will be displayed in colour
in order to facilitate recognition. If the data lines are selected
together with the table presentation, the respective areas will
also be displayed in colour as follows:
Read address: Yellow
Write address: Magenta
Data: Cyan
Start: White
Stop: White
No acknowledge: Red
Ackknowledge: Green
12.3 I
2
Cbustriggering
After conguring the bus, it will be possible to trigger on various
events. To choose the trigger type, press the key TYPE in the
TRIGGER area of the front panel and select the soft menu key
SERIAL BUSES. Subsequently press the key SOURCE in the
TRIGGER area and select the I
2
C bus. (This will only be available
if it was dened before.) After pressing the key FILTER in the
TRIGGER area all possible trigger types will be presented.
It is possible to trigger on the START, STOP of all messages as
well as on NEW START and NOT-ACKNOWLEDGE conditions. For
further trigger options press the soft menu key READ/WRITE. A
menu opens which offers the choice of triggering on READ or
WRITE conditions and whether the address length is 7 or 10 bits.
After pressing the soft menu key SLAVE ADDRESS the universal
knob can be used to select a 7 or 10 bit address on which shall
be triggered.
Fig. 12.5: I
2
C READ/WRITE trigger menu