Fostex G16 - Page 24

Fig. 3.12 Ports of CPU Ul
Terminal (I/O)
Pin Number
Function
The following waveform will be
output when the CPU cannot
determine whether it should
function as the Connector
CPU SELECT
ERROR (O)
45
Board CPU or the Controller
CPU.
-5V
I 1
: i :
—
--0V
A 3 1 c ;
1 1 1
1.8ms 1.8ms
2nd MODE
STROBE (1)
48
HIGH is output when in the 2nd
mode (This is LOW in the normal
mode.).
Refer to 3.3.1.2 for details.
(Explanation on 3.3.1.2 2nd MODE)
If the METER KEY is depressed while Model G16 is in the 2nd MODE, any desired character
can be shown in the display. Characters will be shown on the bargraph LED meter through a
series of functions whereby serial data (character data) sent from the System Control is
received, converted into display data, then transferred to the Controller as serial data.
“ Display ”
System
Control
CPU UI
Character
display
data
Controller
Conversion
to display
data
Fig. 3.13 Display of character by the 2nd MODE
When the 2nd MODE storobe port (pin 48) is HIGH, CPU UI is in the 2nd MODE, indicating
that the original bargraph function (A/D conversion, etc.) is stopped.
If the 2nd MODE ON/OFF port (Pin 7) is LOW, communication with System Control is cut
off, and the 2nd MODE function of CPU UI will cease (consequently, no character will be
shown on the display).
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