EM78P569 View Datasheet(PDF) - ELAN Microelectronics

Part Name

Description

MFG CO.

EM78P569

8-BIT OTP MICRO-CONTROLLER

ELAN Microelectronics 

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EM78P569

8-bit OTP 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.16.

PCRD

Q

P

R

D

Q

C CLK

L

PCWR

PORT

QPD

IOD

R

C CLK

QL

PDWR

0M

U

1

X

PDRD

Fig.16_1 The circuit of I/O port and I/O control register

VDD

VDD

VDD

pull

high

PIN

120

ohm

Fig.16_2 The input/output circuit of EM78P569 input/output ports

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to be changed without notice.

41

8/19/2004 V4.4

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