HT85F2270 datasheet(31/226 Pages) HOLTEK

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Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

18 Flash Program Memory

The Program Memory is the location where the user code or program is stored. For these devices

the Program Memory is Flash type, which means it can be programmed and re-programmed

a large number of times, allowing the user the convenience of code modification on the same

device. By using the appropriate programming tools, these Flash devices offer users the flexibility

to conveniently debug and develop their applications while also offering a means of field

programming and updating.

Structure

The Program Memory has a capacity from 16K×8 to 64K×8. The Program Memory is addressed

by the Program Counter and also contains data, table information and interrupt entries. Table data,

which can be setup in any location within the Program Memory, is addressed by a separate table

pointer register.

Special Vectors

Within the Program Memory, certain locations are reserved for the reset and interrupts. The

location 000H is reserved for use by the device reset for program initialisation. After a device reset

is initiated, the program will jump to this location and begin execution.

�FFFH

Reset

0000H

HT85F2260

000�H

00ABH

HT85F2270 HT85F2280

Interrupt

Vector

8 bits

Reset

Interrupt

Vector

Reset

Interrupt

Vector

7FFFH

FFFFH

Program Memory Structure

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