HT68F03 datasheet(29/147 Pages) HOLTEK

29 / 147 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.30

February 17, 2011

EEPROM Data Memory

The device contains an area of internal EEPROM Data

Memory. EEPROM, which stands for Electrically Eras-

able Programmable Read Only Memory, is by its nature

a non-volatile form of re-programmable memory, with

data retention even when its power supply is removed.

By incorporating this kind of data memory, a whole new

host of application possibilities are made available to the

designer. The availability of EEPROM storage allows in-

formation such as product identification numbers, cali-

bration values, specific user data, system setup data or

other product information to be stored directly within the

product microcontroller. The process of reading and

writing data to the EEPROM memory has been reduced

to a very trivial affair.

EEPROM Data Memory Structure

The EEPROM Data Memory capacity is 64

´8 bits for

this series of devices. Unlike the Program Memory and

RAM Data Memory, the EEPROM Data Memory is not

directly mapped into memory space and is therefore not

directly addressable in the same way as the other types

of memory. Read and Write operations to the EEPROM

are carried out in single byte operations using an ad-

dress and data register in Bank 0 and a single control

Device

Capacity

Address

All devices

´8

00H ~ 3FH

EEPROM Registers

Three registers control the overall operation of the inter-

nal EEPROM Data Memory. These are the address reg-

ister, EEA, the data register, EED and a single control

located in Bank 0, they can be directly accessed in the

same was as any other Special Function Register. The

EEC register however, being located in Bank1, cannot

be addressed directly and can only be read from or writ-

ten to indirectly using the MP1 Memory Pointer and Indi-

rect Addressing Register, IAR1. Because the EEC

control register is located at address 40H in Bank 1, the

MP1 Memory Pointer must first be set to the value 40H

and the Bank Pointer register, BP, set to the value, 01H,

before any operations on the EEC register are exe-

cuted.

· EEPROM Register List

Name

Bit

76543210

¾¾

EEC

¾¾¾¾

WREN

· EEA Register

Bit

76543210

Name

¾¾

R/W

¾¾

R/W

¾¾

xxxxxx

²x² unknown

Bit7~6

Unimplemented, read as

²0²

Bit5~0

Data EEPROM address

Data EEPROM address bit 5 ~ bit 0

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