3822 datasheet(80/328 Pages) RENESAS

80 / 328 page

APPLICATION

2.1 I/O pins

3822 GROUP USER’S MANUAL

2–14

(5) Termination of unused pins

Table 2.1.4 shows termination of unused pins.

Terminations

Pins

Table 2.1.4 Termination of unused pins

P20–P27

P41/

P44/RxD

P45/TxD

P46/SCLK

P47/SRDY

P52/RTP0

P53/RTP1

P54/CNTR0

P55/CNTR1

P56/TOUT

P57/ADT

P60/AN0–P67/AN7

P70/XCOUT

P71/XCIN

P00/SEG16–P07/SEG23

P10/SEG24–P17/SEG31

P40

P42/INT0

P43/INT1

P50/INT2

P51/INT3

VL1–VL3

COM0–COM3

SEG0–SEG11

P34/SEG12–P37/SEG15

Connect each pin to VCC or VSS through each resistor of 1k

to 10 k .

After set for the input mode and put the built-in pull-up resistor in the ON state,

open.V1

Set for the output mode and open at “L” or “H”.V2

V1 After reset and before the built-in pull-up (pull-down) resistor is put in the ON state by software,

the built-in pull-up (pull-down) resistor is in the OFF state. Because of this, the potential at these

pins are “undefined” and the power source current may increase. Since the direction register setup

may be changed for the output mode because of a program runaway or noise, set direction

within 2 cm.

V2 After reset and before I/O ports are switched for the output mode by software, I/O ports are set

for the input mode. Because of this, the potential at these pins are “undefined” and the power

source current may increase in the input mode. Since the direction register setup may be changed

for the input mode because of a program runaway or noise, set direction register for the output

mode periodically. And make the length of wiring which is connected I/O ports within 2 cm.

After set for the input mode and put the built-in pull-down resistor in the ON

state, open.V1

Set for the output mode and open at “L” or “H”.V2

After disabling INT interrupts, set for the input mode, and put the pull-up built-

in resistor in the ON state, open.V1

Set for the output mode and open at “L” or “H”.V2

Connect to VSS level

Open

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