HT68FU50 datasheet(27/244 Pages) HOLTEK

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HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.50

March 15, 2011

Flash Program Memory

The Program Memory is the location where the user

code or program is stored. For this device series 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 modifi-

cation on the same device. By using the appropriate

programming tools, these Flash devices offer users the

flexibility to conveniently debug and develop their appli-

cations while also offering a means of field programming

and updating.

Structure

The Program Memory has a capacity of 1K

´14 bits to

12K

´16 bits. The Program Memory is addressed by the

Program Counter and also contains data, table informa-

tion and interrupt entries. Table data, which can be

setup in any location within the Program Memory, is ad-

dressed by a separate table pointer register.

Device

Capacity

Banks

HT68F20

´14

HT68F30

´14

HT68F40

´15

HT68F50

´16

HT68F60

12K

´16

0, 1

The HT68F60 has its Program Memory divided into two

Banks, Bank 0 and Bank 1. The required Bank is se-

lected using Bit 5 of the BP Register.

Special Vectors

Within the Program Memory, certain locations are re-

served for the reset and interrupts. The location 000H is

reserved for use by the device reset for program initialis-

ation. After a device reset is initiated, the program will

jump to this location and begin execution.

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 and

TBHP. 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

²TABRD[m]² or ²TABRDL[m]² 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

byte will be read as

²0².

The accompanying diagram illustrates the addressing

data flow of the look-up table.

Table Program Example

The following example shows how the table pointer and

table data is defined and retrieved from the

microcontroller. This example uses raw table data lo-

cated in the Program Memory which is stored there us-

I n t e r r u p t

V e c t o r

0 0 0 4 H

0 3 F F H

1 4 b i t s

0 0 2 C H

I n t e r r u p t

V e c t o r

1 4 b i t s

0 7 F F H

I n t e r r u p t

V e c t o r

1 5 b i t s

I n t e r r u p t

V e c t o r

1 6 b i t s

I n t e r r u p t

V e c t o r

R e s e t

0 0 0 0 H

H T 6 8 F 2 0

R e s e t

H T 6 8 F 3 0

R e s e t

H T 6 8 F 4 0

R e s e t

H T 6 8 F 5 0

R e s e t

H T 6 8 F 6 0

0 0 3 C H

B a n k 0

1 6 b i t s

0 F F F H

1 F F F H

2 0 0 0 H

2 F F F H

B a n k 1

Program Memory Structure

R e g i s t e r T B L H

U s e r S e l e c t e d

R e g i s t e r

H i g h B y t e

L o w B y t e

T B L P R e g i s t e r

D a t a

1 4 ~ 1 6 b i t s

P r o g r a m M e m o r y

L a s t p a g e o r

T B H P R e g i s t e r

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