E2Prom Control Circuit - Epson FX-870 Service Manual

Principles of Operation
2
E 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.
Data Bus
SCK
SDA
SDA
Figure 6-31. EZPROM Control Circuit
Epson FX-870/1170
6-30