HT48F70E datasheet(21/58 Pages) HOLTEK

21 / 58 page

HT48F70E

Rev. 1.30

July 29, 2009

WriteCommand:

; Write instruction code subroutine

MOV

A,3

; Read, write and erase instructions are 3 bits

; long

MOV

COUNT,A

SET

_SK

; Dummy bit transmission for 256x8 bit EEPROM Memory

; capacity

CLR

_SK

; Not required for 128x8 bit EEPROM Memory capacity devices

WriteCommand_0:

CLR

_DI

; Prepare the transmitted bit

EE_command.7

; Check value of highest instruction code bit

SET

_DI

SET

_SK

CLR

_SK

CLR

RLC

EE_command

; Get next bit of instruction code

SDZ

COUNT

; Check if last bit has been transmitted

JMP

WriteCommand_0

CLR

_DI

RET

Example 2

- Transmitting an Address to the EEPROM

WriteAddr:

; Write address subroutine

MOV

A,C_Addr_Length

; Setup address length

MOV

COUNT,A

SET

_SK

; Dummy bit transmission for 256

´8 bit EEPROM Memory

; capacity

CLR

_SK

; Not required for 128x8 bit EEPROM Memory capacity devices

WriteAddr_0:

CLR

_DI

ADDR.7

; Check value of address MSB

SET

_DI

CLR

RLC

ADDR

; Get next address bit

SET

_SK

CLR

_SK

SDZ

COUNT

; Check if address LSB has been written

JMP

WriteAddr_0

CLR

_DI

RET

Example 3

- Writing Data to the EEPROM

WriteData:

MOV

A,C_Data_Length

; Setup data length

MOV

COUNT,A

WriteData_0:

CLR

_DI

WR_Data.7

; Check value of data MSB

SET

_DI

CLR

RLC

WR_Data

; Get next address bit

SET

_SK

CLR

_SK

SDZ

COUNT

; Check if data LSB has been written

JMP

WriteData_0

CLR

_CS

; CS low edge initiates internal write cycle

SET

_CS

; CS high edge allows DO to be used to indicate

; end of write cycle

SNZ

_DO

; Poll for DO high to indicate end of write

; cycle

JMP

$-1

RET

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