M35074 Datasheet, PDF (32/44 Pages) Renesas Technology Corp – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35074-XXXSP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
NOTE FOR SUPPLYING POWER
__
(1) Timing of power supplying to AC pin
The internal circuit of M35074-XXXSP is reset when the
__
level of the auto clear input pin AC is "L". This pin in hysteresis
input with the pull-up resistor.
__
The timing about power supplying of AC pin is shown in Figure 15.
After supplying the power (VDD and VSS) to M35074-XXXSP
and the supply voltage becomes more than 0.8 ✕ VDD, it needs
__
to keep VIL time; tw of the AC pin for more than 1ms.
__
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
__
Fig.17 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.
_
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 (ad-
dress 12716) .
tf
90%
Horizontal synchronous signal
10%
DATA REQUIRED FOR MASK ROM
ORDERING
Please send the following data for mask orders.
(1) M35074-XXXSP mask ROM order confirmation form
(2) 20P4B mark specification form
(3) ROM data : EPROMs or floppy disks
*In the case of EPROMs, thres sets of EPROMs are required
per pattern.
*In the case of floppy disks, 3.5-inch 2HD disk (1BM format) is
required per pattern.
tr
31