HT48R063B datasheet(17/84 Pages) HOLTEK

17 / 84 page

HT48R063B/064B/065B/066B

Rev. 1.00

April 7, 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 1K

´14 to

´16. 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.

Device

Capacity

HT48R063B

HT48R064B

´14

HT48R065B

´15

HT48R066B

´15

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 0/1 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.

· Time base interrupt vector

This internal vector is used by the internal Time Base.

If a Time Base overflow occurs, the program will jump

to this location and begin execution if the Time Base

counter interrupt is enabled and the stack is not full.

0 0 H

H T 4 8 R 0 6 3 B

H T 4 8 R 0 6 4 B H T 4 8 R 0 6 5 B

R e s e t

H T 4 8 R 0 6 6 B

7 F F H

3 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 0

I n t e r r u p t

T i m e B a s e

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 0

I n t e r r u p t

T i m e B a s e

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 0

I n t e r r u p t

T i m e B a s e

I n t e r r u p t

T i m e r 1

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

F F F H

1 4 b i t s

1 5 b i t s

Program Memory Structure

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