HT45F0057 datasheet(12/81 Pages) HOLTEK

12 / 81 page

Rev. 1.30

May 17, 2022

Rev. 1.30

May 17, 2022

HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

Flash Program Memory

The Program Memory is the location where the user code or program is stored. For this device 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, the Flash device 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 of 4K×16 bits. 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

Reset

000H

004H

018H

FFFH

Interrupt Vectors

16 bits

Program Memory Structure

Look-up Table

Any location within the Program Memory can be defined as a look-up table where programmers can

store fixed data. To use the look-up table, the table pointer must first be setup by placing the address

of the look up data to be retrieved in the table pointer register, TBLP. These registers define the total

address of the look-up table.

After setting up the table pointer, the table data can be retrieved from the Program Memory

using the “TABRDC [m]” or “TABRDL [m]” instructions, respectively. When the instruction is

executed, the lower order table byte from the Program Memory will be transferred to the user

defined Data Memory register [m] as specified in the instruction. The higher order table data byte

from the Program Memory will be transferred to the TBLH special register. Any unused bits in this

transferred higher order byte will be read as 0.

The accompanying diagram illustrates the addressing data flow of the look-up table.

PC High Byte

TBLP Register

Data

16 bits

Program Memory

User Selected

High Byte

Low Byte

Last page or

present page

PC11~PC8

HT45F0057 Datasheet(PDF) 12 Page - Holtek Semiconductor Inc

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