HT83F02 datasheet(15/64 Pages) HOLTEK

15 / 64 page

HT83F02

Rev. 1.20

November 19, 2010

Data Memory

The Data Memory is a volatile area of 8-bit wide RAM in-

ternal memory and is the location where temporary in-

formation is stored. Divided into two sections, the first of

these is an area of RAM where special function registers

are located. These registers have fixed locations and

are necessary for correct operation of the device. Many

of these registers can be read from and written to di-

rectly under program control, however, some remain

protected from user manipulation. The second area of

RAM Data Memory is reserved for general purpose use.

All locations within this area are read and write accessi-

ble under program control.

Structure

The Data Memory has a bank, known as Bank, which is

implemented in 8-bit wide RAM. The RAM Data Memory

is located in Bank 0 which is also subdivided into two sec-

tions, the Special Purpose Data Memory and the General

Purpose Data Memory. The length of these sections is

dictated by the type of microcontroller chosen.

The start address of the RAM Data Memory for all de-

vices is the address

²00H², and the last Data Memory

address is

²FFH². Registers which are common to all

microcontrollers, such as ACC, PCL, etc., have the

same Data Memory address.

General Purpose Data Memory

All microcontroller programs require an area of

read/write memory where temporary data can be stored

and retrieved for use later. It is this area of RAM memory

that is known as General Purpose Data Memory. This

area of Data Memory is fully accessible by the user pro-

gram for both read and write operations. By using the

²SET [m].i² and ²CLR [m].i² instructions individual bits

can be set or reset under program control giving the

user a large range of flexibility for bit manipulation in the

Data Memory.

Special Purpose Data Memory

This area of Data Memory, is located in Bank, where

registers, necessary for the correct operation of the

microcontroller, are stored. Most of the registers are

both readable and writable but some are protected and

are readable only, the details of which are located under

the relevant Special Function Register section. Note

that for locations that are unused, any read instruction to

these addresses will return the value

²00H².

Special Function Registers

To ensure successful operation of the microcontroller,

certain internal registers are implemented in the Data

Memory area. These registers ensure correct operation

of internal functions such as timers, interrupts, etc., as

S p e c i a l P u r p o s e

D a t a M e m o r y

0 0 H

F F H

2 F H

G e n e r a l P u r p o s e

D a t a M e m o r y

( 2 0 8 B y t e s )

3 0 H

RAM Data Memory Structure

Note: Most of the RAM Data Memory bits can be

directly manipulated using the

²SET [m].i² and

²CLR [m].i² instructions with the exception of a

few dedicated bits. The RAM Data Memory can

also be accessed through the Memory Pointer

registers MP.

0 0 H

0 1 H

0 2 H

0 3 H

0 4 H

0 5 H

0 6 H

0 7 H

0 8 H

0 9 H

0 A H

0 B H

0 C H

0 D H

0 E H

0 F H

1 0 H

1 1 H

1 2 H

1 3 H

1 4 H

1 5 H

1 6 H

1 7 H

1 8 H

1 9 H

1 A H

1 B H

1 C H

1 D H

1 E H

1 F H

2 0 H

2 1 H

2 2 H

2 3 H

2 4 H

2 5 H

2 6 H

2 7 H

2 8 H

2 9 H

2 A H

2 B H

2 C H

2 D H

2 E H

2 F H

3 0 H

F F H

: U n u s e d ,

r e a d a s " 0 0 "

I A R 0

M P 0

A C C

P C L

T B L P

T B L H

W D T S

S T A T U S

I N T C

T M R 0

T M R 0 C

T M R 1

T M R 1 C

P A

P A C

P B

P B C

P C

P C C

I N T C H

S I M C 0 B

S I M C 1 B

S I M D R B

S I M A R B / S I M C 2 B

D A L

D A H

P W M C

P W M L

P W M H

V O L

S I M C 0 A

S I M C 1 A

S I M D R A

S I M A R A / S I M C 2 A

P C P H C

U s e r D a t a R A M

Special Purpose Data Memory Structure

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