M35071 Datasheet, PDF (30/40 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35071-XXXSP/FP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
NOTE FOR SUPPLYING POWER
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(1)Timing of power supplying to AC pin
The internal circuit of M35071-XXXSP/FP is reset when the level
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of the auto clear input pin AC is “L”. This pin in hysteresis input with
the pull-up resistor.
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The timing about power supplying of AC pin is shown in Figure 16.
After supplying the power (VDD and VSS) to M35071-XXXSP/FP
and the supply voltage becomes more than 0.8 × VDD, it needs to
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keep VIL time; tw of the AC pin for more than 1ms.
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Start inputting from microcomputer after AC pin supply voltage
becomes more than 0.8 × VDD and keeping 200ms wait time.
(2)Timing of power supplying to VDD1 and VDD2.
Supply power to VDD1 and VDD2 at the same time.
Voltage [V]
VDD
0.8 x VDD
Supply voltage
Data input disable
VAC
(AC pin input voltage)
0.2 x VDD
tW
more than 1ms
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Fig. 16 Timing of power supplying to AC pin
Time t [s]
tS
PRECAUTION FOR USE
Notes on noise and latch-up
In order to avoid noise and latch-up, connect a bypass capacitor
(≈0.1µF) directly between the VDD1 pin and VSS1 pin, and the VDD2
pin and VSS2 pin using a heavy wire.
Note for waveform timing of the horizontal signals to the HOR pin
Set horizontal synchronous signal edge^∗ waveform timing to under
5ns and input to HOR pin.
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Set only the side which set by B/F register waveform timing under
5ns and input to HOR pin.
∗_:
Set
front
porch
edge
or
back
porch
edge
by
_
B/F
register.
DATA REQUIRED FOR MASK ROM ORDERING
Please send the following data for mask orders.
(1) M35071-XXXSP/FP mask ROM order confirmation form
(2) 20P4B mask specification form
(3) 20P2Q-A mask specification from
(4) ROM data (EPROM 3 sets)
(5) Floppy disks containing the character font generating program
+ character data
tf
tr
90%
Horizontal synchronous signal
10%
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