User’s Manual
Page 7
8.0
FUNCTIONAL BLOCK DIAGRAMS
8.1 Pins 2-9 simplified block diagram
Fig. 2 Simplified functional block diagram for pins 2-9.
8.2 Pins 1,14,16 and 17 simplified block diagram
Fig. 3 Simplified functional block diagram for outputs 1, 14, 16 and 17.
Note
: “Internal Enable”
=
“External Enable Pin”
AND
(
“SCHP”
OR
“Bypassed SCHP”)
The “Internal Enable” is the result of an AND Operation between the “External Enable Pin” and
the SCHP operation mode selected by the user.
Note:
The outputs will be deactivated if the board is not connected to the PC parallel port.
