
ÉlanSC310 Microcontroller Evaluation Board User’s Manual
3-15
1.
0
Page Up
The Page Up key displays data on the previous 16-Kbyte boundary. For example,
if the current device data starting at offset 4100h is being displayed, and Page Up
is pressed, the data from device offset 0100h is displayed.
Page Down
The Page Down key does the inverse of the Page Up key; it displays data from the
next 16-Kbyte boundary.
Space Bar
The Space Bar (or any key besides the other command keys listed in this section)
simply rereads the data from the selected resource, and refreshes the main data
display screen. The main data screen does not constantly update normally. Press
the Space Bar (or any other non-command key as specified in this list) to refresh
the screen with the new data. For a continuous read mode, see the c command
below.
a
This key is only useful on boards with PCMCIA.
c
The c key is useful for detecting changes in reading the data from a given resource.
An example application for this feature is in the detection of timing problems
(incorrect wait-state setup, etc.). When you press the c key, a “snapshot” of the
current device data is taken, and stored into a local buffer. After this, continuous
reads of the current device data are compared to the buffer. Miscompares cause
the offending byte location to Flash, and the result of an Exclusive OR between
the buffer (snapshot) and the current device data is displayed. This allows bit errors
to be picked out easily.
Upon leaving Continuous Read/Compare mode, the blink attribute is removed from
the characters for easier reading of the resulting data. The bytes which have the bit
miscompares are left highlighted in white (versus light gray for the normal data).
Any new command which causes the data to be read from the device again removes
the highlight attribute from the displayed data completely. If the highlight attribute
needs to be removed without losing the bit error data which may have been
captured, the r command may be used (see below).
evalbd.book : ch3 Page 15 Thursday, August 8, 1996 2:34 PM