HT45F23 datasheet(32/152 Pages) HOLTEK

32 / 152 page

EEPROM Data Memory

The device contains 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 is 64

´8 bits. 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

HT45F43

´8

00H ~ 3FH

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

Name

Bit

76543210

EEA

¾¾

EED

EEC

¾¾¾¾

WREN

RDEN

EEA Register

Bit

76543210

Name

¾¾

R/W

¾¾

R/W

POR

¾¾

xxxxxx

²x² unknown

Bit7~6

Unimplemented, read as

²0²

Bit5~0

Data EEPROM address

Data EEPROM address bit 5 ~ bit 0

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

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