HT46R92 datasheet(10/61 Pages) HOLTEK

10 / 61 page

HT46R92

Rev. 1.10

November 5, 2008

The accompanying diagram illustrates the address-

ing/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

microcontroller. This example uses raw table data lo-

cated in the last page which is stored there using the

ORG statement. The value at this ORG statement is

²700H² which refers to the start address of the last page

within the 2K Program Memory. The table pointer is setup

here to have an initial value of

²06H². This will ensure that

the first data read from the data table will be at the Pro-

gram Memory address

²706H² or 6 locations after the start

of the last page. Note that the value for the table pointer is

referenced 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

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

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

H i g h 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

²706H² 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

²705H² 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

700h

; sets initial address of last page

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

Instruction

Table Location Bits

b10

TABRDC[m]

PC10

PC9

PC8

TABRDL [m]

Table Location

Note:

PC10~PC8: Current Program Counter bits

@7~@0: Table Pointer TBLP bits

The Table address location is 11 bits, i.e. from b10~b0.

HT46R92 Datasheet(PDF) 10 Page - Holtek Semiconductor Inc

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