HT45R37 datasheet(14/100 Pages) HOLTEK

14 / 100 page

HT45R37

Rev. 1.10

January 29, 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. 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

Data Memory is reserved for general purpose use. All

locations within this area are read and write accessible

under program control.

Structure

The Data Memory is subdivided into two sections, the

Special Purpose Data Memory and the General Pur-

pose Data Memory. The start address of the Data Mem-

ory is the address

²00H². The last Data Memory

address is

²FFH².

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 Data 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 read and write type

but some are protected and are read only, the details of

which are located under the relevant Special Function

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

D a t a M e m o r y

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

6 0 H

F F H

5 F H

Data Memory Structure

Note:

Most of the Data Memory bits can be directly ma-

nipulated using the

²SET [m].i² and ²CLR [m].i²

with the exception of a few dedicated bits. The

Data Memory can also be accessed through the

memory pointer registers MP0 and MP1.

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

3 1 H

3 2 H

3 3 H

3 4 H

3 5 H

3 6 H

3 7 H

3 8 H

3 9 H

3 A H

3 B H

3 C H

3 D H

3 E H

3 F H

4 0 H ~ 5 H F

: 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

R T C C

S T A T U S

I N T C 0

T M R 0

T M R 0 C

P A

P A C

P B

P B C

P C

P C C

P D

P D C

P W M 0 L

P W M 0 H

P W M 1 L

P W M 1 H

I N T C 1

M F I C 0

M F I C 1

A S C R 0

A S C R 1

A S C R 2

A D R L

A D R H

A D C R

A C S R

C L K M O D

P A W U

P A P U

P B P U

P C P U

P D P U

I N T E D G E

M I S C

T M R A H

T M R A L

R C O C C R

T M R B H

T M R B L

R C O C R

S I M C T L 0

S I M C T L 1

S I M D R

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

T M R 1

T M R 1 C

: U n u s e d r e a d a s u n k n o w n

Special Purpose Data Memory

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