3850 datasheet(64/101 Pages) RENESAS

64 / 101 page

Rev.3.01

2003.06.20

page 64 of 98

3850 Group (Spec.H/A)

Table 14 Description of pin function (Standard Serial I/O Mode)

Description

VCC,VSS

Apply program/erase protection voltage to Vcc pin and 0 V to Vss pin.

CNVSS

Connect to VCC when VCC = 4.5 V to 5.5 V.

Connect to Vpp (=4.5 V to 5.5 V) when VCC = 2.7 V to 4.5 V.

RESET

Reset input pin. While reset is “L” level, a 20 cycle or longer clock

must be input to XIN pin.

XIN

Connect a ceramic resonator or crystal oscillator between XIN and

XOUT pins. To input an externally generated clock, input it to XIN pin

and open XOUT pin.

XOUT

Name

Power input

CNVSS

Reset input

Clock input

Clock output

I/O

AVSS

VREF

Connect AVSS to VSS .

Enter the reference voltage for AD from this pin.

P00 to P07

Input “H” or “L” level signal or open.

P10 to P17

Input “H” or “L” level signal or open.

P20 to P23

Input “H” or “L” level signal or open.

Analog power supply input

Reference voltage input

Input port P0

Input port P1

Input port P2

P41

Input “H” level signal, when reset is released.

P40, P42 to P44

Input “H” or “L” level signal or open.

P24

Serial data input pin

P25

P26

Serial clock input pin

P27

BUSY signal output pin

Input port P4

RxD input

TxD output

SCLK1 input

BUSY output

Serial data output pin

P30 to P34

Input “H” or “L” level signal or open.

Input port P3

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