HT83F60 datasheet(11/62 Pages) HOLTEK

11 / 62 page

HT83FXX

Rev. 1.30

June 7, 2010

Because the TBLH register is a read-only register and

cannot be restored, care should be taken to ensure its

protection if both the main routine and Interrupt Service

Routine use table read instructions. If using the table

read instructions, the Interrupt Service Routines may

change the value of the TBLH and subsequently cause

errors if used again by the main routine. As a rule it is

recommended that simultaneous use of the table read

instructions should be avoided. However, in situations

where simultaneous use cannot be avoided, the inter-

rupts should be disabled prior to the execution of any

main routine table-read instructions. Note that all table

related instructions require two instruction cycles to

complete their operation.

Instruction

Table Location

*10

TABRDC [m]

P10

TABRDL [m]

Table Location

Note:

*10~*0: Current Program ROM table

P10~P8: Write P12~P8 to TBHP pointer register

@7~@0: Write @7~@0 to TBLP pointer register

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.

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

7 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

( 8 0 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 instruc-

tions with the exception of a few dedicated bits. The RAM Data Memory can also be accessed through the

Memory Pointer registers MP.

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