M35080FP datasheet(25/28 Pages) RENESAS

25 / 28 page

MITSUBISHI MICROCOMPUTERS

M35080FP

SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

Fig.19 Timing of power supplying to AC pin

NOTE FOR SUPPLYING POWER

(1)

Timing of power supplying to AC pin

The internal circuit of M35080FP 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 be-

low.

After supplying the power (VDD and VSS) to M35080FP 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.

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.

Notes on the time of external clock input to TCK pin

Input the continuous external clock which cycle is fixed and syn-

chronized with horizontal synchronized signal from TCK pin. And,

input continuous horizontal synchronized signal which cycle is

fixed from HOR pin. Do not stop clock input absolutely during dis-

play.

(2) Timing of power supplying to VDD1 and VDD2.

Supply power to VDD1 and VDD2 at the same time.

VDD

0.8 ✕ VDD

0.2 ✕ VDD

Voltage [V]

Supply voltage

Time t [s]

Data input disable

VAC

(AC pin input voltage)

M35080FP 데이터시트(PDF) 25 Page - Renesas Technology Corp