HT48R01M datasheet(13/69 Pages) HOLTEK

13 / 69 page

HT46R01M/HT46R02M/HT48R01M/HT48R02M

Rev. 1.10

March 8, 2010

Data Memory

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

internal memory and is the location where temporary in-

formation is stored.

Structure

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 cor-

rect operation of the device. Many of these registers can

be read from and written to directly under program con-

trol, however, some remain protected from user manipu-

lation. The second area of Data Memory is reserved for

general purpose use. All locations within this area are

read and write accessible under program control.

The two sections of Data Memory, the Special Purpose

and General Purpose Data Memory are located at con-

secutive locations. All are implemented in RAM and are 8

bits wide but the length of each memory section is dic-

tated by the type of microcontroller chosen. The start ad-

dress of the Data Memory for all devices is the address

²00H².

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 where registers, necessary

for the correct operation of the microcontroller, are

stored. Most of the registers are both readable and

writeable but some are protected and are readable only,

the details of which are located under the relevant Spe-

cial Function Register section. Note that for locations

that are unused, any read instruction to these addresses

will return the value

²00H².

G e n e r a l

P u r p o s e

R e g i s t e r s

S p e c i a l

P u r p o s e

R e g i s t e r s

0 0 H

0 1 H

4 0 H

I A R 0

M P 0

9 F H

3 F H

9 6 b y t e s

Data Memory Structure

Note:

Most of the Data Memory bits can be directly

manipulated using the

²SET [m].i² and ²CLR

[m].i

² with the exception of a few dedicated bits.

The Data Memory can also be accessed

through the memory pointer registers.

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

3 F H

: U n u s e d , r e a d a s " 0 0 "

I A R 0

M P 0

I A R 1

M P 1

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 0

T M R 0

T M R 0 C

T M R 1

T M R 1 C

P A

P A C

P A P U

P A W K

P B

P B C

P B P U

C T R L 0

C T R L 1

I N T C 1

P W M 0

A D R L

A D R H

A D C R

A C S R

I A R 0

M P 0

I A R 1

M P 1

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 0

T M R 0

T M R 0 C

T M R 1

T M R 1 C

P A

P A C

P A P U

P A W K

P B

P B C

P B P U

C T R L 0

C T R L 1

I N T C 1

P W M 0

A D R L

A D R H

A D C R

A C S R

I A R 0

M P 0

I A R 1

M P 1

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 0

T M R 0

T M R 0 C

T M R 1

T M R 1 C

P A

P A C

P A P U

P A W K

P B

P B C

P B P U

C T R L 0

C T R L 1

I N T C 1

I A R 0

M P 0

I A R 1

M P 1

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 0

T M R 0

T M R 0 C

T M R 1

T M R 1 C

P A

P A C

P A P U

P A W K

P B

P B C

P B P U

C T R L 0

C T R L 1

I N T C 1

H T 4 6 R 0 1 M

H T 4 6 R 0 2 M

H T 4 8 R 0 1 M

H T 4 8 R 0 2 M

Special Purpose Data Memory

HT48R01M Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

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