HT48F06E datasheet(21/69 Pages) HOLTEK

21 / 69 page

HT48F06E/HT48F10E/HT48F30E

Rev. 1.00

September 10, 2007

Initialising the EEPROM

After the MCU is powered on and if the EEPROM is to

be used, it must be initialised in a specific way before

any user instructions are transmitted. This is achieved

by first transmitting an EWEN instruction, then by issu-

ing a WRITE instruction to write random data to any sin-

gle address in the EEPROM. The initialisation

procedure can then be terminated by issuing an EWDS

instruction, however at this point, if actual user data is to

be imminently written to the EEPROM, this last step is

optional.

N o

Y e s

I s s u e i n s t r u c t i o n

A d d r e s s , D a t a

I n t e r n a l w r i t e c y c l e i n i t i a t e d

I n t e r n a l w r i t e

c y c l e f i n i s h e d

D O = " 1 "

D O w i l l g o l o w h e r e t o i n d i c a t e i n t e r n a l

w r i t e c y c l e s t i l l i n p r o g r e s s

t S V d e l a y

t C D S d e l a y

C S

Internal Write Cycle Busy Polling

The following is an example program of how this can be implemented:

mov

A,01h

mov

BP,A

; set to bank 1

mov

A,40h

mov

MP1,A

; set MP1 to EECR address

call

EWEN

; subroutine to run EWEN instructions

mov

A, 7Fh

mov

EEADDR, A

mov

A, 55h

mov

EEDATA, A

call

WRITE

; subroutine to run WRITE instruction

; write 55h data to address 7Fh

call

EWDS

; optional subroutine to run EWDS instruction

EEPROM Program Examples

The following short programs gives examples of how to send instructions, read and write to the EEPROM. These pro-

grams can form a basis of understanding as to how the internal EEPROM memory is to be used to store and retrieve

data.

Example 1

- Definitions and Sending Instructions to the EEPROM

_CS

EQU

IAR1.4

; EEPROM lines setup to have a corresponding

_SK

EQU

IAR1.5

; Bit in the Indirect Addressing Register IAR1

_DI

EQU

IAR1.6

; EEPROM can only be indirectly addressed using

; MP1

_DO

EQU

IAR1.7

_EECR

EQU

40H

; Setup address of the EEPROM control register

C_Addr_Length

EQU 7

; Address length

- 7-bits

C_Data_Length

EQU 8

; Data length

- always 8-bits

;

DATA

.SECTION at 70h

¢DATA¢

EE_command

; Stores the read or write instruction

; information

ADDR

; Store write data or read data address

WR_Data

; Store read or write data

COUNT

; Temporary counter

;

HT48F06E датащи(PDF) 21 Page - Holtek Semiconductor Inc

HT48F06E датащи(HTML) 21 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69

датащи скачать

ссылки URL