Reset Circuit; Buscontrolcircuit - Epson ActionLaser 1600 EPL-5600 Service Manual

2.2.1.1 Reset Circuit

The entire system (the CPU and the external devices) can be initialized if the RESET signal (CPU
pin 113) are active simultaneously. This circuit uses an h451938 IC to monitor the supply voltage if
a voltage level less than 425 V is detected. The reset time is approximately 128 ma.
L
+
c
2.2.1.2
Bus Control Circuit
The MB86930 CPU outputs the R/W (read/write) signal, AS (address strobe) signal, and the B131,
BE1, BE2, and BE3 signals (byte embles) to the ASIC E05A91. The ASIC E05A91 uses these signals
to generate the RD (read strobe) signal, WR (write strobe) signal, and READY signal.
CPU
(ICI)
Rev. A
OUT
READY
Address
Bus
Figure 2-39. Bus Control Circuit
L
Data
Bus
2-19