Epson PX-8 - Page 73

REV.-A
Observed Shift Clock Wave Forms
SCK:
Measured
at 1 D, pin 4
Figures
2-45 through 2-47 show the SCK sig-
nal
waveforms which should be observed dur-
ing a serial data transfer. Fig.
2-45 is
an enlargement of the single negative going
pulse shown in Fig. 2-47. Fig. 2-46 further en-
larges one pulse in Fig.
2-44.
The three pulses shown in fig. 2-46 are used to
allow the 7508 to perform the following opera-
tions, in order
from left to right:
1) Fetch the
command stored in the gate array
GAH40M to 7508.
2) Select the tiPD7008 channel.
3)
Read the A-D converted data from tiPD7001.
Note: Fig. 2-46 and 2-47 are enlargements of
the signal shown in Fig. 2-45.
2-49
2V
5V 10mS
Fig. 2-45 SCK Signal Waveform (Serial
Data Trans for) Enlargement
2V 5V
200~S
Fig. 2-46 SCK Waveform Pulse Enlarge-
ment 2 (Serial Data Transfer)
2V
Fig. 2-47 SCK Signal Waveforms During
Serial Data Transfer