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M35052 Datasheet(PDF) 32 Page - Renesas Technology Corp |
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M35052 Datasheet(HTML) 32 Page - Renesas Technology Corp |
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32 / 37 page  MITSUBISHI MICROCOMPUTERS M35052-XXXSP/FP SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS 31 Note for Supplying Power (1) __ Timing of power supplying to AC pin The internal circuit of M35052-XXXSP/FP is reset when the level __ of the auto clear input pin AC is “L”. This pin is hysteresis input __ 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 __ __ 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- __ 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. 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 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. __ Fig. 20 Timing of power supplying to AC pin Supply voltage VDD 0.8!VDD 0.2!VDD tw Voltage mV n Time t [s] VAC i AC pin input voltage j ts |
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