EM785841M Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM785841M

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

EM785840/5841/5842

8-bit Micro-controller

VII.4 I/O Port

The I/O registers are bi-directional tri-state I/O ports. The I/O ports can be defined as "input" or "output" pins by

the I/O control registers under program control. The I/O data registers and I/O control registers are both readable

and writable. The I/O interface circuit is shown in Fig.9.

PCRD

Q

P

R

D

C CLK

QL

PCWR

PORT

QPD

IOD

R

C CLK

QL

PDWR

0M

U

1

X

PDRD

Fig.9_1 The circuit of I/O port and I/O control register

VDD

VDD

VDD

pull

high

PIN

120

ohm

Fig.9_2 The input/output circuit of EM785840 input/output ports

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to change without notice.

24

2004/11/10 V1.2

Share Link: