HT56R22 datasheet(21/131 Pages) HOLTEK

21 / 131 page

HT56R22/HT56R23/HT56R24/HT56R25/HT56R26

Rev. 1.00

March 11, 2010

Table Read Program Example:

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

mov a,06h

; initialise table pointer - note that this address

; is referenced

mov tblp,a

; to the last page or present page

tabrdl

tempreg1

; transfers value in table referenced by table pointer

; to tempregl

; data at prog. memory address

²706H² transferred to

; tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrdl

tempreg2

; transfers value in table referenced by table pointer

; to tempreg2

; data at prog.memory address

²705H² transferred to

; tempreg2 and TBLH

; in this example the data

²1AH² is transferred to

; tempreg1 and data

²0FH² to register tempreg2

; the value

²00H² will be transferred to the high byte

; register TBLH

org 700h

; sets initial address of last page

00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

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.

Device

Capacity

Banks

HT56R22

128

´8

0, 2

HT56R23

256

´8

0, 2

HT56R24

640

´8

0, 2~5

HT56R25

1152

´8

0, 2~9

HT56R26

2304

´8

0, 2~18

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.

For some devices, the Data Memory is subdivided into

banks, which are selected using a Bank Pointer. Only

data in Bank 0 can be directly addressed, data in Bank

2~n must be indirectly addressed.

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