HT45F43 datasheet(27/152 Pages) HOLTEK

27 / 152 page

RAM Data Memory

The Data Memory is a volatile area of 8-bit wide RAM internal memory and is the location where

temporary information 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 correct operation of the device.

Many of these registers can be read from and written to directly 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.

The overall Data Memory is subdivided into two banks. The Special Purpose Data Memory registers

are accessible in all banks, with the exception of the EEC register at address 40H, which is only

accessible in Bank 1. Switching between the different Data Memory banks is achieved by setting the

Bank Pointer to the correct value. The start address of the Data Memory 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 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

under program control giving the user a large range of flexibility for bit manipulation in the Data

Memory.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

S p e c i a l

P u r p o s e

R e g i s t e r s

B F H

I A R 0

0 0 H

B a n k 0

B a n k 1

M P 0

0 1 H

I A R 0

M P 0

4 0 H

E E C

G e n e r a l

P u r p o s e

R e g i s t e r s

3 F H

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

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.

HT45F43 датащи(PDF) 27 Page - Holtek Semiconductor Inc

HT45F43 датащи(HTML) 27 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL