HT46R01A datasheet(9/58 Pages) HOLTEK

9 / 58 page

HT46R01A

Rev. 1.10

August 13, 2008

The following diagram illustrates the addressing/data

flow of the look-up table:

Table Program Example

The following example shows how the table pointer and

table data is defined and retrieved from the device. This

example uses raw table data located in the last page

which is stored there using the ORG statement. The

value at this ORG statement is

²300H² which refers to

the start address of the last page within the 1K Program

Memory. The table pointer is setup here to have an ini-

tial value of

²06H². This will ensure that the first data

read from the data table will be at the Program Memory

address

²306H² or 6 locations after the start of the last

page. Note that the value for the table pointer is refer-

enced to the first address of the present page if the

²TABRDC [m]² instruction is being used. The high byte

of the table data which in this case is equal to zero will

be transferred to the TBLH register automatically when

the

²TABRDL [m]² instruction is executed.

P r o g r a m

M e m o r y

P r o g r a m C o u n t e r

H i g h B y t e

T B L P

T B L H

S p e c i f i e d b y [ m ]

T a b l e C o n t e n t s H i g h B y t e

T a b l e C o n t e n t s L o w B y t e

tempreg1

; temporary register #1

tempreg2

; temporary register #2

mov

a,06h

; initialise table pointer - note that this address

; is referenced

mov

tblp,a

; to the last page or present page

tabrdl

tempreg1

; transfers value in table referenced by table pointer

; to tempregl

; data at prog. memory address

²306H² transferred to

; tempreg1 and TBLH

dec

tblp

; reduce value of table pointer by one

tabrdl

tempreg2

; transfers value in table referenced by table pointer

; to tempreg2

; data at prog.memory address

²305H² transferred to

; tempreg2 and TBLH

; in this example the data

²1AH² is transferred to

; tempreg1 and data

²0FH² to register tempreg2

; the value

²00H² will be transferred to the high byte

; register TBLH

org

300h

; sets initial address of last page

00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

Instruction

Table Location Bits

TABRDC [m]

PC9

PC8

TABRDL [m]

Table Location

Note:

PC9~PC8: Current Program Counter bits

@7~@0: Table Pointer TBLP bits

HT46R01A датащи(PDF) 9 Page - Holtek Semiconductor Inc

HT46R01A датащи(HTML) 9 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

датащи скачать

ссылки URL