HT85F2240 datasheet(2/147 Pages) HOLTEK

2 / 147 page

Rev. 1.10

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

Table of Contents

1 Features................................................................................................................. 11

CPU Feat�res.................................................................................................................... 11

Periphera� Feat�res........................................................................................................... 1�

2 General Description ............................................................................................. 13

3 Selection Table...................................................................................................... 14

4 Block Diagram....................................................................................................... 15

5 Pin Assignment..................................................................................................... 16

6 Pin Descriptions ................................................................................................... 17

7 Absolute Maximum Ratings................................................................................. 19

8 D.C. Characteristics.............................................................................................. 19

9 A.C. Characteristics.............................................................................................. 21

10 ADC Electrical Characteristics .......................................................................... 22

11 Comparator Electrical Characteristics.............................................................. 23

12 Power on Reset Electrical Characteristics....................................................... 24

13 System Architecture........................................................................................... 24

14 Program Counter ................................................................................................ 25

15 Stack .................................................................................................................... 25

16 Arithmetic and Logic Unit – ALU....................................................................... 26

17 Flash Program Memory...................................................................................... 27

Str�ct�re............................................................................................................................ �7

Specia� Vectors.................................................................................................................. �7

In-Circ�it Programming – ICP ........................................................................................... �8

On-Chip Deb�g S�pport – OCDS ..................................................................................... �8

In-App�ication Programming – IAP .................................................................................... �9

F�ash Program Memor� Resisters..................................................................................... �9

F�ash Memor� Read/Write Operations.............................................................................. ��

Un�ocking the F�ash Memor�........................................................................................................ ��

Page Erase Operation.................................................................................................................. �4

B�te Read Operation.................................................................................................................... ��

B�te Write Operation .................................................................................................................... �6

Program Memor� Protection ............................................................................................. �8

Memor� Protection Contro� B�tes................................................................................................. �8

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