M35054 MITSUBISHI [Mitsubishi Electric Semiconductor], M35054 Datasheet - Page 26

• Manufacturer Part Number: M35054
• Description: SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS???
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

(2) Before setting registers at the starting of system, be sure to reset
(3) Power supply noise
(4) Synchronous correction action
(5) Notes on f
(6) Forbidding to stop entering the f
(7) Forbidding to set data during the period in which the internal
1) Set “0” in the register DSPON (address F8
2) Effect the settings a), b), and c) given above.
26
the M35052-XXXSP/FP by applying “L” level to the AC pin.
When power supply noise is generated, the internal oscillator cir-
cuit does not stabilize, whereby causing horizontal jitters across
the picture display. Therefore, connect a bypass capacitor be-
tween the power supply and GND.
When switching channel or in the special playback mode (quick
playback, rewinding, and so on) of VTR, effect of synchronous
correction becomes strong, and distortion of a character is apt to
occur because the continuity of video signal is suddenly switched.
When the continuity of video signal is out of order, erasure of
displayed characters is recommended in a extreme short time to
raise the quality of displayed characters.
This IC amplifies the subcarrier frequency (f
PAL system: 3.58MHz, PAL system: 4.43MHz) input to the OSCIN
pin (17-pin) and generates the composite video signal internally.
The amplified f
a) When the f
b) When the waveform of the f
c) When DC level in the f
This IC doesn’t properly work if the f
the OSCIN pin (pin 17), so don’t stop the f
the IC. To stop the IC, turn the display off (set 0 in the register
DSPON (address F8
oscillation circuit stabilizes
a) To start entering the f
b) To start oscillating the oscillation circuit for display when its
c) To turn on the internal bias when it is turned off. (to assign “1”
There can be instances in which data are not properly set in the
registers until the internal oscillation circuit stabilizes, so follow
the steps in sequence as given below.
off)
ditions.
When the amplified signal is unstable, the composite video
signal generated inside the IC is also unstable in terms of syn-
chronization with the subcarrier and phase.
Consequently, this results in color flicker and lost synchroniza-
tion when the composite video signal is generated. Make note
of the fact that this may prevent a stable blue background from
being formed.
oscillation is stopped. (to assign “1” to the register STOP1 (ad-
dress F8
to the register LEVEL1 (address F8
SC
16
SC
) when it is assigned “0”, or the like.)
signal input
SC
signal is outside of recommended operating con-
signal can be destabilized in the following cases.
16
).)
SC
SC
signal when its input is stopped.
waveform fluctuates.
SC
signal is distorted.
SC
SC
16
signal
signal is not entered into
) when it is assigned “0”.)
16
SC
). (the display is turned
SC
signal so as to work
) signal (NTSC, M-
__
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
3) Wait 20 ms (the period necessary for the internal oscillation cir-
4) Set necessary data in other registers, and make the display RAM
M35054-XXXFP/M35055-XXXFP
cuit to stabilize) before entering data.
ready.
MITSUBISHI MICROCOMPUTERS