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HT56R668

TinyPower™ A/D Type with LCD 8-Bit MCU

Holtek Semiconductor

HT56R668 Datasheet PDF : 104 Pages

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HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688

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. For devices with larger Data Memory ca-

pacities, the General Purpose Data Memory, in addition

to being located in Bank 0, is also stored in Banks 2 to

12, the actual number of banks present depends upon

the device selected.

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

unknow value. The Special Function registers are

mapped into all banks and can therefore be accessed

from any bank location.

Display Memory

The data to be displayed on the LCD or LED display is

stored in an area of fully accessible Data Memory. By

writing to this area of RAM, the display output can be di-

rectly controlled by the application program. As this

Memory exists in Bank 1, but have addresses which

map into the General Purpose Data Memory, it is neces-

sary to first ensure that the Bank Pointer is set to the

value ²01H² before accessing the Display Memory. The

Display Memory can only be accessed indirectly using

the Memory Pointer MP1 and the indirect addressing

access the Display Memory, if any addresses with a

value less than ²40H² are read, the Special Purpose

Memory in Bank 0 will be accessed. Also, if the Bank

Pointer is set to Bank 1, if any addresses higher than the

last address in Bank 1 are read, then a value of ²00H²

will be returned.

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

well as external functions such as I/O data control and

A/D converter operation. The location of these registers

within the Data Memory begins at the address ²00H².

Any unused Data Memory locations between these spe-

cial function registers and the point where the General

Purpose Memory begins is reserved for future expan-

sion purposes, attempting to read data from these loca-

tions will return a unknow value.

H T56R 67

H T 5 6 R 6 6 8 /H T 5 6 C 6 6 8

H T 5 6 R 6 7 8 /H T 5 6 C 6 7 8

H T56R 688

00H

IA R 0

01H

M P0

02H

IA R 1

03H

M P1

04H

05H

ACC

06H

PCL

07H

TB LP

08H

TB LH

09H

R TC C

0A H

STATU S

0B H

IN T C 0

0C H

0D H

TM R 0

0E H

TM R 0C

0FH

TM R 1H

10H

TM R 1L

11H

TM R 1C

12H

13H

PAC

14H

15H

PBC

16H

17H

PCC

18H

19H

PDC

1A H

P W M 0L

1B H

P W M 0H

1C H

P W M 1L

1D H

P W M 1H

1E H

IN T C 1

1FH

20H

P W M 2L

21H

P W M 2H

22H

P W M 3L

23H

P W M 3H

24H

ADRL

25H

ADRH

26H

ADCR

27H

ACSR

28H

C LK M O D

29H

PAW U

2A H

PAPU

2B H

PBPU

2C H

PCPU

2D H

PDPU

2E H

IN T E D G E

2FH

30H

LC D C TR L

31H

LC D O U T1

32H

LC D O U T2

33H

M IS C

34H

M F IC 0

35H

M F IC 1

36H

S IM C T L 0

37H

S IM C T L 1

38H

S IM D R

39H

S IM A R /S IM C T L 2

3A H

TM R 2

3B H

TM R 2C

3C H

TM R 3

3D H

TM R 3C

3E H

3FH