HT46F49E datasheet(20/88 Pages) HOLTEK

20 / 88 page

HT46F46E/HT46F47E/HT46F48E/HT46F49E

Rev. 1.40

July 28, 2009

EEPROM Data Memory Instruction Set

Control over the internal EEPROM, to execute functions

such as read, write, disable, enable etc, is implemented

through instructions of which there are a total of seven.

The related instruction is transmitted to the EEPROM

via the DI bit, after CS has first been set to

²1² to enable

the EEPROM and a start bit

²1² has been transmitted.

For the READ, WRITE and ERASE instructions, each of

the three instructions has its own two bit related instruc-

tion code. The address should then be transmitted,

which in the case of devices with a 128

´8 capacity

EEPROM is 7-bits. For devices with a 256

´8 capacity

EEPROM, a 9-bit address is transmitted, however the

first bit is a dummy bit and can have any value. The ad-

dress is transmitted in MSB first format.

For the other four instructions,

²EWEN², ²EWDS²,

²ERAL² and ²WRAL², after the start bit has been trans-

mitted a

²00² instruction code should then follow. The

address information should then follow which is 7-bits

long for devices with a 128

´8 capacity EEPROM, and

9-bits long for devices with a 256

´8 capacity EEPROM.

The first two bits of this address is instruction dependant

as shown in the table while the remaining bits have don

¢t

care values and can be either high or low.

After any write or erase instruction is issued, the internal

write function of the EEPROM will be used to write the

data into the device. As this internal write operation uses

the EEPROM

¢s own internal clock, no further instruc-

tions will be accepted by the EEPROM until the internal

write function has ended. After power on and before any

instruction is issued the EEPROM must be properly in-

itialised to ensure proper operation.

Instruction

Function

Start Bit

Instruction

Code

Address

Data

READ

Read Out Data Byte(s)

A6~A0

D7~D0

ERASE

Erase Single Data Byte

A6~A0

WRITE

Write Single Data Byte

A6~A0

D7~D0

EWEN

Erase/Write Enable

11 XXXXX

EWDS

Erase/Write Disable

00 XXXXX

ERAL

Erase All

10 XXXXX

WRAL

Write All

01 XXXXX

D7~D0

EEPROM Instruction Set Summary

- Except HT46F49E

Instruction

Function

Start Bit

Instruction

Code

Address

Data

READ

Read Out Data Byte(s)

X, A7~A0

D7~D0

ERASE

Erase Single Data Byte

X, A7~A0

WRITE

Write Single Data Byte

X, A7~A0

D7~D0

EWEN

Erase/Write Enable

11 XXXXXXX

EWDS

Erase/Write Disable

00 XXXXXXX

ERAL

Erase All

10 XXXXXXX

WRAL

Write All

01 XXXXXXX

D7~D0

EEPROM Instruction Set Summary

- HT46F49E

HT46F49E Datasheet(PDF) 20 Page - Holtek Semiconductor Inc

HT46F49E Datasheet(HTML) 20 Page - Holtek Semiconductor Inc

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