M35053 Datasheet, PDF (31/47 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35053-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 M35052-XXXSP/FP is reset when the level
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of the auto clear input pin AC is “L”. This pin is hysteresis input
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with the pull-up resistor. The timing about power supplying of AC
pin is shown in Figure 20. tW is the interval after the supply volt-
age becomes 0.8 ! VDD or more and before the supply voltage to
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the AC pin (VAC) becomes 0.2 ! VDD or more.
After supplying the power (VDD and VSS) to M35052-XXXSP/FP,
the tW time must be reserved for 1ms or more. Before starting
input from the microcomputer, the waiting time (ts) must be re-
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served for 500ms after the supply voltage to the AC pin becomes
0.8 ! VDD or more.
(2) Timing of power supplying to VDD1 pin and VDD2 pin
The power need to supply to VDD1 and VDD2 at a time, though it
is separated perfectly between the VDD1 as the digital line and
the VDD2 as the analog line.
Voltage [V]
VDD
0.8 ! VDD
Supply voltage
0.2 ! VDD
tw
VAC _{(AC pin input voltage)}
Time t [s]
ts
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Fig. 20 Timing of power supplying to AC pin
PRECAUTION FOR USE
Notes on noise and latch-up
Connect a capacitor (approx. 0.1 ˚F) between pins VDD and VSS at
the shortest distance using relatively thick wire to prevent noise and
latch up.
ROM ORDERING METHOD
Please submit the information described below when ordering Mask
ROM.
(1) ROM Order Confirmation Form ................................................. 1
(2) Data to be written into mask ROM ................................ EPROM
(three sets containing the identical data)
(3) Mark Specification Form ............................................................ 1
(4) Program for character font generating + froppy disk in which char-
acter data is input
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