HT66F40 datasheet(36/244 Pages) HOLTEK

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HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.60

October 24, 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 varies from 32x8

to 256

´8 bits, according to the device selected. 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 address and data regis-

ter in Bank 0 and a single control register in Bank 1.

Device

Capacity

Address

HT68F20

´8

00H ~ 1FH

HT68F30

´8

00H ~ 3FH

HT68F40

128

´8

00H ~ 7FH

HT68F50/HT68F60

256

´8

00H ~ FFH

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

cated 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

directly addressed directly and can only be read from or

written to indirectly using the MP1 Memory Pointer and

Indirect 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 executed.

· EEPROM Register List

¨ HT68F20

Name

Bit

76543210

EEA

¾¾¾

EED

EEC

¾¾¾¾

WREN

RDEN

¨ HT68F30

Name

Bit

76543210

EEA

¾¾

EED

EEC

¾¾¾¾

WREN

RDEN

¨ HT68F40

Name

Bit

76543210

EEA

EED

EEC

¾¾¾¾

WREN

RDEN

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