HT85F2270 datasheet(118/226 Pages) HOLTEK

118 / 226 page

Rev. 1.00

118 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

26 Input/Output Ports

The devices offer a range of flexible options on their I/O ports. Many pins can be setup with a

choice of different register controlled modes as well as having pull-high wake up and slew rate

functions.

Input/Output Port Overview

The devices are provided with a series bidirectional input/output ports labeled with port names

P0~P5. These I/O ports are mapped to the Special Function Registers with specific addresses as

shown in the Special Function Registers table. All of these I/O ports can be used for both input and

output operations, the data for which is stored in Port Data Registers. Ports P0~P3 can be setup

using Port Mode Registers to operate in a series of different modes. Ports 4 and 5 can only operate

in the traditional 8051 type quasi-bidirectional mode. The Port P0 provides register controlled wake

up function as well. Bit manipulation instructions can be used to control Ports P0~P3, while Ports

4 and 5 must be controlled using byte wide instructions.

I/O Port Function Summary

Function.

Port Number

Notes

Push-Pull

√

—

C�OS Output

Open Drain

√

—

N�OS

Quasi Bi-direct

√

Traditional 80�1 Port t�pe

Input Onl�

√

—

High impedance

Bit Addressable

√

—

Slew Rate Control

√

Fast or Slow select

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