HP 5300A - A1 U2 Character Generator

Model 5300A
Theory of Operation
Figure 4-6A. U2 Character Generator
v2 BRIGHTNESS
1820-0571 CONTROL
ENCODER
CONSTANT
DECODER CURRENT
DRIVERS
AIU2
CHARACTER
GENERATOR
4-32. A1U2 CHARACTER GENERATOR
4-33. The character generator decodes the digit in-
formation along with the right/left code and gen-
erates the pattern on its 10 output lines for the half-
digit being addressed. A list of output codes for all
allowable input ‘codes is shown in Table 4-1 and
should be used in conjunction with Figure 4-5. A dia-
gram is shown in Figure 4-6A and B. The character
generator also controls the brightness of the display
by regulating the current provided to each diode.
4-34. In the 5300A the data source can be in the plug-
on module but is normally the six decade counter,
AlU3. If A1U3 Counter is to be used, the digit
address lines X, Y, and Z are connected to the digit
select lines X, Y, and Z via the plug-on connector.
This automatically connects the counter data to the
character generator as well as to the plug-on module.
BINARY SS
€s
R/L (RIGHT/LEFT ADORESS)
“th
AsUl
SCANNER
Zz
DIGIT ADORESS
(BINARY CODED)
Atus
DATA SOURCE
(6 DECADE COUNTER
OR DATA FROM
PLUG - ON)
4. OIGIT NUMBER CORRESPONDS
WITH @INARY DIGIT ADDRESS
Ci7 SETS FREQUENCY
OF INTERNAL FREE-
RUNNING CLOCK
OIGiT ADORESS
CODES
4-6