38D2 datasheet(84/136 Pages) RENESAS

84 / 136 page

Rev.3.02

Apr 10, 2008

Page 84 of 131

REJ03B0177-0302

38D2 Group

Table 19 Description of pin function (Flash Memory Standard Serial I/O Mode 1)

Pin name

Signal name

I/O

Function

VCC,VSS

Power supply

Apply 2.7 to 5.5 V to the VCC pin and 0 V to the Vss pin.

CNVSS

After input of port is set, input “H” level.

RESET

Reset input

Reset input pin. To reset the microcomputer, RESET pin should be

held at an “L” level for 16 cycles or more of XIN.

XIN

Clock input

Connect an oscillation circuit between the XIN and XOUT pins.

As for the connection method, refer to the “clock generating circuit”.

XOUT

Clock output

AVSS

Analog power supply input

Connect AVss to VSS.

VREF

Reference voltage input

Apply reference voltage of A/D convertor to this pin.

P00

−P07, P10−P17,

P20

−P27, P34−P37,

P40

−P47, P50−P57,

P60

−P62

I/O port

I/O

Input “L” or “H” level, or keep open.

P33

RxD input

Serial data input pin.

P32

TxD output

Serial data output pin.

P31

SCLK input

Serial clock input pin.

P30

BUSY output

BUSY signal output pin.

Table 20 Description of pin function (Flash Memory Standard Serial I/O Mode 2)