Table of Contents
Advertisement
RXD0
TXD1
RXD1
RS1
CS1
IC40
MPU
MD0
ı
DATA
MD15
MA0
ı
MA19
X3
SYSTEM
CLOCK
19.660MHz
4-1. SPG MODE
The MPU (IC40) reads the mode selected with the key
matrix, and writes video data corresponding to the mode
into the left side of dual port RAM (IC38, 39) every 1/60
second. On the other hand, the counters (IC4-10) are
rotated by the clock selected with the change-over switch
(IC2) to read out video data written by the MPU (IC40)
from the right side in the order of Jumbo Tron format.
For the synchronization, SYNC signal, EOF signal, and
line addresses are added, then they are coded by the 10-10
signal converter (IC31, 32). (To insulate the unit, the
signals are forced through the pulse transformer before
they are received, so that the 10-10 conversion is made to
remove adirect current component. Also, the transmission
error detection is executed.) The coded data are serial-
parallel converted (IC33) to be serial signals, then
JME-UA200
SECTION 4
CIRCUIT DESCRIPTIONS
KEY
MATRIX
LCD
MODUL
IC51
PROGRAM
ROM
IC54
SRAM
ADDRESS
IC52
FLASH
MEMORY
DUAL
IC38, 39
PORT
RAM
IC50
SENSOR
CONTROL
LINE SELECT
FILTER
AMP
Fig. 1 Block Diagram
IC35
LINE
RECEIVER
IC53
DRIVER/
RECEIVER
IC2
IC4-10
COUNTER
IC13,14
IC11,12
IC31,32
ADR
BLK
10-10
SIGNAL
CONVERTER
GAIN SELECT
GAIN
SENSOR
AMP
transmitted to the unit by the differential line driver (IC34).
(By the amount of 32 dots in horizontal direction)
4-2. ADJUST MODE
Various codes for brightness adjustment or unit control are
transmitted with vertical sync part (483 blocks for NTSC,
or 580 blocks for PAL) after video data. Normally, non-
processing codes (NOP codes) are transmitted with these
blocks, but if the commandsfor brightness adjustment and
unit control are entered from the keyboard, the MPU
(IC40) writes the control codes indual port RAM (IC38,
39), and they are inserted into the control data blocks and
trans-mitted. (One command every 1/60 sec forNTSC, or
one command every 1/50 sec for PAL)
From UNIT
To PC
X2
18.88MHz
CLOCK
NTSC
X1
18.75MHz
CLOCK
PAL
IC33
IC34
P/S
LINE
To UNIT
CONVERTER
DRIVER
UNIT SENSOR
JME-US15L
4-1(E)
Advertisement
Table of Contents
