Service
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
This circuit uses an
to monitor the supply voltage if
a voltage level less than 4.25 V is detected.
reset time is approximately 128 ms.
L
+
OUT
c
4
Figure 2-38. Reset Circuit
2.2.1.2 Bus
Circuit
The
CPU outputs the R/W (read/write) signal, AS (address strobe) signal, and the BE(),
BE1, BE2, and BE3 signals (byte
to the
The
uses these signals
to generate the RD (read strobe) signal, WR (write strobe) signal, and READY signal.
(ICI)
●
- u
—
AS
CPU
BE()-3
WR
Bus Bus
Figure 2-39. Bus Control Circuit
2-26
Rev.
