38D2 datasheet(23/136 Pages) RENESAS

23 / 136 page

Rev.3.02

Apr 10, 2008

Page 23 of 131

REJ03B0177-0302

38D2 Group

• Termination of unused pins

• Termination of common pins

I/O ports:

Select an input port or an output port and follow

each processing method.

In addition, it is recommended that related

registers be overwritten periodically to prevent

malfunctions, etc.

Output ports: Open.

Input ports: If the input level become unstable, through current

flow to an input circuit, and the power supply

current may increase.

Especially, when expecting low consumption

current (at STP or WIT instruction execution etc.),

pull-up or pull-down input ports to prevent

through current (built-in resistor can be used).

We recommend processing unused pins through a

resistor which can secure IOH(avg) or IOL(avg).

Because, when an I/O port or a pin which have an

output function is selected as an input port, it may

operate as an output port by incorrect operation

etc.

Table 9

Termination of unused pins

Termination 1

Termination 2

Termination 3

P00/SEG0/(KW4)

−P07/SEG7

I/O port

When selecting SEG output, open.

−

P10/SEG8

−P17/SEG15

P20/SEG16

−P27/SEG23/VL2

P30/SRDY2/(LED0),

P57/SRDY1/(KW3)

When selecting SRDY function,

perform termination of output port.

−

P31/SCLK2/(LED1),

P56/SCLK1/(KW2)

When selecting external clock input,

perform termination of input port.

When selecting internal clock output,

perform termination of output port.

P32/TXD2/(LED2),

P55/TXD1/(KW1)

When selecting TxD function, perform

termination of output port.

−

P33/RXD2/(LED3),

P54/RXD1/(KW0)

When selecting RxD function,

perform termination of input port.

−

P34/INT2/(LED4)

When selecting INT function, perform

termination of input port.

−

P35/TXOUT1/(LED5)

When selecting TXOUT function,

perform termination of output port.

−

P36/T2OUT/CKOUT/(LED6)

When selecting T2OUT function or CKOUT

function, perform termination of output port.

−

P37/CNTR0/TXOUT2/(LED7)

When selecting TXOUT function,

perform termination of output port.

−

P40/OOUT0/AN0,

P41/OOUT1/AN1

When selecting AN function, these

pins can be opened. (A/D conversion

result cannot be guaranteed.)

When selecting oscillation output,

perform termination of output port.

P42/AN2/ADKEY

When selecting ADKEY function,

pull-up this pin through a resistor.

P43/AN3

−P47/RTP1/AN7

−

P50/INT0,

P51/INT1

When selecting INT function, perform

termination of input port.

−

P52/T3OUT/PWM0,

P53/T4OUT/PWM1

When selecting PWM, T3OUT, or T4OUT

function, perform termination of output port.

−

P60/CNTR1

When selecting CNTR input function,

perform termination of input port.

−

P61/XCIN,

P62/XCOUT

Do not select XCIN-XCOUT oscillation

function by program.

−

VL3

Set the VL3 connect bit to “1”

and apply a Vcc level

voltage to VL3 pin.

Set the VL3 connect bit to “0” and

leave the VL3 pin open.

−

COM0

−COM3

Open

−−

AVss

Connect to Vss

−−

VREF

Connect to Vcc

−−

XIN

When only on-chip oscillator

is used, connect to VCC

through a resistor.

−−

XOUT

When external clock is input

or when only on-chip

oscillator is used, open.

−−

38D2 Datasheet(PDF) 23 Page - Renesas Technology Corp

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