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HT46R92

A/D Type 8-Bit MCU with 16
16 High Current LED Driver

Holtek Semiconductor 

HT46R92

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.

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

00H

S p e c ia l P u r p o s e

D a ta M e m o ry

27H

28H

G e n e ra l P u rp o s e

D a ta M e m o ry

7FH

Data Memory Structure

Note:

Most of the Data Memory bits can be directly

manipulated 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.

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 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

address of the Data Memory for all devices is the ad-

dress ²00H². Registers which are common to all

microcontrollers, such as ACC, PCL, etc., have the

same Data Memory address.

General Purpose Data Memory

All 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 Mem-

ory is fully accessible by the user program for both read

and write operations. By using the ²SET [m].i² and ²CLR

[m].i² instructions individual bits can be set or reset un-

der program control giving the user a large range of flex-

ibility for bit manipulation in the Data Memory.

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

0A H S TA TU S

0 B H IN T C 0

0C H

0D H

TM R

0E H TM R C

0FH

10H

11H

12H

PA

13H

PAC

14H

PB

15H

PBC

16H

PC

17H

18H

PD

19H

1A H

PE

1B H P W M 0

1C H P W M 1

1D H

1 E H IN T C 1

1FH

LC D C

20H M O D E

21H

22H

23H

24H

ADRL

25H A D R H

26H A D C R

27H

ACSR

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

Special Purpose Data Memory

Rev. 1.10

11

November 5, 2008

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