HT85F2270 datasheet(43/226 Pages) HOLTEK

43 / 226 page

Rev. 1.00

4� of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

■

Security Type 2

For the HT85F2280 device, the inhibit bytes SECURITY2[0:15] are located at the addresses

0x10~0x1F of the ID block page 0. If a value, with the exception of 0FFH, is written into these

bytes, the sectors corresponding to SECURITY2[0:15] cannot be programmed, erased or read

when in any mode. Since these bytes can only be written once, to release the respective sectors

in the unprotected mode, the device must be erased.

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

the SECURITY2[0:15] bytes are written with a value other than 0FFH:

SECURITY2[N]

N=0~15

Program

Erase

Read

Protect

Sector #

Remove

Protection

ICP

N/A(1)

Erase All

IAP

OCDS(�)

X(�)

X(4)

Erase All

�ain Program

X(�)

X(4)

Erase All

�

OCDS(�)

N/A(�)

X(4)

Erase All

�ain Program

N/A(�)

X(4)

Erase All

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

(�) “N/A” means none of these functions.

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

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

(�) When in the OCDS mode� onl� the OCDSINSTR instruction has the securit� protection

mechanism.

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

HT85F2260 Program Memory Contents

The HT85F2260 program memory is divided into 4 sectors, each with a capacity of 4k bytes.

Page

Address

Description

0x00~0x0�

SECURITY1[0]~SECURITY1[�]

0x04~0x0F

Not used

0x10~0x1�

SECURITY�[0]~SECURITY�[�]

0x14~0x1F

Not used

0x�0~0x6F

Reserved

0x70~0x7F

Reserved

0x80~0x8�

Reserved

0x84~0x8F

Reserved

0x90~0x9�

Reserved

0x94~0x9F

Reserved

0xA0~0xEF

Reserved

0xF0~0xFF

Reserved

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