HT67F60 datasheet(48/242 Pages) HOLTEK

48 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

EEPROM Data Memory

All devices contain an area of internal EEPROM Data Memory. EEPROM, which stands for

Electrically Erasable 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 information such as product

identification numbers, calibration 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 64x8 to 256x 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 register in Bank 0 and a single control register in Bank 1.

Device

Capacity

Address

HT67F30

64x8

00H ~ 3FH

HT67F40

128x8

00H ~ 7FH

HT67F50/HT67F60

256x8

00H ~ FFH

EEPROM Registers

Three registers control the overall operation of the internal EEPROM Data Memory. These are the

address register, EEA, the data register, EED and a single control register, EEC. As both the EEA and

EED registers are 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 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

●

HT67F30

Name

Bit

EEA

—

EED

EEC

—

WREN

RDEN

●

HT67F40

Name

Bit

EEA

—

EED

EEC

—

WREN

RDEN

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