HT68FB240 datasheet(2/133 Pages) HOLTEK

2 / 133 page

Rev. 1.00

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Rev. 1.00

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HT68FB240

USB Low Speed 8-Bit Flash MCU

Table of Contents

Features............................................................................................................ 6

CPU Featu�es ......................................................................................................................... 6

Pe�i�he�a� Featu�es................................................................................................................. 6

General Description......................................................................................... 7

Block Diagram.................................................................................................. 7

Pin Assignment................................................................................................ 8

Pin Description ................................................................................................ 8

Absolute Maximum Ratings.......................................................................... 10

D.C. Characteristics....................................................................................... 10

A.C. Characteristics........................................................................................11

LVD & LVR Electrical Characteristics .......................................................... 12

Power on Reset Characteristics................................................................... 12

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

C�ocking and Pi�e�ining......................................................................................................... 13

P�og�am Counte�................................................................................................................... 1�

Stack ..................................................................................................................................... 15

��ithmetic and Logic Unit – �LU ........................................................................................... 15

Flash Program Memory................................................................................. 16

St�uctu�e................................................................................................................................ 16

S�ecia� Vecto�s ..................................................................................................................... 16

Look-u� Tab�e........................................................................................................................ 16

Tab�e P�og�am Exam��e........................................................................................................ 17

In System P�og�amming – ISP.............................................................................................. 1�

F�ash Memo�y Read/W�ite Page Size ................................................................................... 1�

ISP Boot�oade� ...................................................................................................................... �0

F�ash P�og�am Memo�y Registe�s ........................................................................................ �0

In ��ication P�og�am – I�P ................................................................................................ ��

In Ci�cuit P�og�amming – ICP ............................................................................................... ��

On-Chi� Debug Su��o�t – OCDS ......................................................................................... �9

RAM Data Memory......................................................................................... 29

St�uctu�e................................................................................................................................ �9

Special Function Register Description........................................................ 31

Indi�ect �dd�essing Registe� – I�R0� I�R1 ........................................................................... 31

Memo�y Pointe�s – MP0� MP1 ............................................................................................. 31

Bank Pointe� – BP ................................................................................................................ 3�

�ccumu�ato� – �CC............................................................................................................... 3�

P�og�am Counte� Low Registe� – PCL ................................................................................. 3�

Look-u� Tab�e Registe�s – TBLP� TBHP� TBLH .................................................................... 3�

Status Registe� – ST�TUS ................................................................................................... 33

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