LC86E5420

No.6805-9/21

Pin name I / O

Function description

Option

PROM mode

PORT8

P80 to P83

I

•4-bit input port

TA (*4)

P84 to P87 I / O •4-bit input / output port

Input / output can be specified in bit unit

•Other function

AD input port (AN7 to AN0)

RES

I

Reset pin.

XT1 / P74

I

•Input pin for the 32.768kHz cyrstal oscillation

•Other function

XT1 : Input port P74

•In case of non use, connect to VDD

XT1 / P75

O

•Output pin for the 32.768kHz cyrstal oscillation

•Other function

XT2 : Input port P75

•In case of non use, connect to VDD at using

as port or unconnect at using as oscillation.

CF1

I

Input pin for the ceramic resonator oscillation.

CF2

O

Output pin for the ceramic resonator oscillation.

All of port options except the pull-down resistor option of Port 0 can be specified in a bit unit.

*1 Memory select input for data security

*2 Output enable input

*3 Chip enable input

*4 TA

→ EPROM control signal input