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Principles of Operation
E
2
PROM Control Circuit
Figure 6-31 shows the
E2PROM
control circuit. The
E2PROM
is non-volatile memory containing
information, such as the top-of-form position. Because the E2PROM is a serial I/O device, the gate
array converts the parallel data (sent
fiorn
the host computer) into serial data.
-
SCL
B5A66YA
(IC4) CPU
(IC2Cl)
Data Bus
SCK
SDA
SDA
Figure 6-31.
EZPROM
Control Circuit
-
6-30
Epson FX-870/1170