M35046 Datasheet, PDF (26/40 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35046-XXXSP/FP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
NOTE FOR SUPPLYING POWER
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Timing of power supplying to AC pin
The internal circuit of M35046-XXXSP/FP is reset when the level of
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the auto clear input pin AC is “L”. This pin in hysteresis input with the
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pull-up resistor. The timing about power supplying of AC pin is shown
in Figure 11.
Timing of power supplying to VDD1 and VDD2.
Supply power to VDD1 and VDD2 at the same time.
Voltage
[V]
VDD
0.8 × VDD
Supply voltage
VAC
(AC pin input voltage)
0.2 × VDD
tW
more than 1ms
tS
Time t[s]
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Fig. 11 Timing of power supplying to AC pin
After supplying the power (VDD and VSS) to M35046-XXXSP/FP and
the supply voltage becomes more than 0.8 × VDD, it needs to keep
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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.
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 VSS pin, and the VDD2 pin
and VSS pin using a heavy wire.
DATA REQUIRED FOR MASK ROM ORDERING
Please send the following data for mask orders.
(1) M35046-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
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