HT48R005 datasheet(14/62 Pages) HOLTEK

14 / 62 page

HT48R005/HT46R005

Rev. 1.00

November 29, 2011

Program Memory

The Program Memory is the location where the user

code or program is stored. The device is supplied with

One-Time Programmable, OTP, memory where users

can program their application code into the device. By

using the appropriate programming tools, OTP devices

offer users the flexibility to freely develop their applica-

tions which may be useful during debug or for products

requiring frequent upgrades or program changes.

Structure

The Program Memory has a capacity of 0.5K

´14 to

´15. The Program Memory is addressed by the Pro-

gram 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 separate table pointer registers.

Special Vectors

Within the Program Memory, certain locations are re-

served for special usage such as reset and interrupts.

· Reset Vector

This vector 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.

· External interrupt vector

This vector is used by the external interrupt. If the ex-

ternal interrupt pin on the device receives an edge

transition, the program will jump to this location and

begin execution if the external interrupt is enabled and

the stack is not full. The external interrupt active edge

transition type, whether high to low, low to high or both

is specified in the CTRL1 register.

· Timer/Event counter interrupt vector

This internal vector is used by the Timer/Event Coun-

ters. If a Timer/Event Counter overflow occurs, the

program will jump to its respective location and begin

execution if the associated Timer/Event Counter inter-

rupt is enabled and the stack is not full.

· A/D interrupt vector

This internal vector is used by the A/D converter. If

A/D conversion complete , the program will jump to

this location and begin execution if the A/D interrupt is

enabled and the stack is not full.

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 lower order address of the

look up data to be retrieved in the table pointer register,

TBLP. This register defines the lower 8-bit address of

the look-up table.

After setting up the table pointer, the table data can be

retrieved from the current Program Memory page or last

Program Memory page using the

²TABRDC[m]² or

²TABRDL [m]² instructions, respectively. When these in-

structions are executed, the lower order table byte from

the Program Memory will be transferred to the user de-

fined Data Memory register [m] as specified in the in-

struction. The higher order table data byte from the

Program Memory will be transferred to the TBLH special

byte will be read as

²0².

0 0 H

H T 4 8 R 0 0 5

H T 4 6 R 0 0 5

R e s e t

1 F F H

E x t e r n a l

I n t e r r u p t

T i m e r

I n t e r r u p t

R e s e t

E x t e r n a l

I n t e r r u p t

T i m e r

I n t e r r u p t

0 4 H

0 8 H

0 C H

1 0 H

1 4 H

1 8 H

1 4 b i t s

A / D

I n t e r r u p t

0 0 H

1 F F H

0 4 H

0 8 H

0 C H

1 0 H

1 4 H

1 8 H

Program Memory Structure

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