REV.-A
Table 2-5. Functions of the Main and Circuits (Cont.)
or Circuit
PROM
MROM
(Mask ROM)
HEAD GATE
ARRAY
Vref Circuit
Location
. . .
Functions
PROM contains the program that runs the CPU.
Holds the CPU working area and the various buffers. (1E is not used for an
column device and is not installed.)
Holds the character design (also called the character generator).
is an electronically
and erasable ROM used to hold such
information as the TOF position.
This is a gate array
of three components configured on a single chip:
Change order of the Head pulse outputs
Mode 1:
Mode 2:
●
Delay
low noise)
●
Image data latching
This is a circuit for generating the reference voltage used in the A/D
within the CPU.
2.3.2 Reset Circuit
Figure 2-19 shows the reset circuit block diagram. The reset circuit issues the /RESET signal. Each
part of the control
is initialized when this /RESET signal is received. The renditions when the
/RESET signal is output are described below.
When Turning on the Power Supply
Immediately after the power has been turned on, PST 529
outputs the
pulse.
receives this pulse and then outputs the /DISC pulse. The electrical charge in the
is then discharged. After this, The
port within
detects the low level and
then outputs the /RESET signal from the /OUT port of
After a certain time has elapsed, the
charge in the condenser builds up again. The
signal is canceled and then the /RESET signal
is canceled.
Resets performed by the CPU
(CPU
self-reset)
The CPU outputs the /RESET signal if there is a /RESET request for
and
output the
/DISC pulse. ”
+5
R30
107
,
IOUT
I
I
E05A50(IC11)
I
Figure 2-19. Reset Circuit Block Diagram
2-15
