HT85F2240 datasheet(39/147 Pages) HOLTEK

39 / 147 page

Rev. 1.10

�9 of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

■

Security Type 2

Take the HT85F2240 as an example, its inhibit bytes SECURITY2[0:3] are located at the

addresses 0x10~0x0B of the ID block page 0. If a value, with the exception of 0FFH, is written

to SECURITY2[N], this sector can not be programmed, erased or read when in any mode.

The following table illustrates the protection state in the OCDS/ICP/IAP/MOVC modes when

the SECURITY2[0:3] bytes are written with a value other than 0FFH:

SECURITY2[N]

N=0~3

Program

Erase

Read

Protect

Sector #

Remove

Protection

ICP

N/A(1)

Erase A��

IAP

OCDS(�)

X(�)

X(4)

Erase A��

Main Program

X(�)

X(4)

Erase A��

OCDS(�)

N/A(�)

X(4)

Erase A��

Main Program

N/A(�)

X(4)

Erase A��

Note: (1) “N/A” means no path to read ROM code.

(�) “N/A” means witho�t this f�nction.

(�) “X” stands for inhibited; “O” stands for enab�ed.

(4) If a read operation is inhibited, reading to the Flash will return a fixed Flash code of 00H.

(�) In the OCDS mode� on�� when exec�ting the OCDSINSTR instr�ction wi�� the sectors be

protected.

The following tables illustrate the corresponding address ID sectors and the inhibited bytes.

HT85F2240 Program Memory Contents

The HT85F2240 program memory is divided into 4 sectors, each with a capacity of 1k bytes.

Page

Address

Description

0x00~0x0�

SECURITY1[0]~ SECURITY1[�]

0x04~0x07

Not �sed

0x08~0x0B

SECURITY�[0]~ SECURITY�[�]

0x0C~0x0F

Not �sed

0x10~0x1F

Reserved

0x�0~0x�F

Reserved

0x�0~0x�F

Reserved

HT85F2230 Program Memory Contents

The HT85F2230 program memory is divided into 2 sectors, each with a capacity of 1k bytes.

Page

Address

Description

0x00~0x01

SECURITY1[0]~ SECURITY1[1]

0x0�~0x07

Not �sed

0x08~0x09

SECURITY�[0]~ SECURITY�[1]

0x0A~0x0F

Not �sed

0x10~0x1F

Reserved

0x�0~0x�F

Reserved

0x�0~0x�F

Reserved

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