HT45F23 datasheet(24/152 Pages) HOLTEK

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Look-up Table

Any location within the Program Memory can be defined as a look-up table where programmers can

store fixed data. To use the look-up table, the table pointer must first be setup by placing the lower

order address of the look up data to be retrieved in the table pointer register, TBLP. This register

defines the lower 8-bit address of the look-up table.

After setting up the table pointer, the table data can be retrieved from the current Program Memory

page or last Program Memory page using the

²TABRDC[m]² or ²TABRDL [m]² instructions,

respectively. When these instructions are executed, the lower order table byte from the Program

Memory will be transferred to the user defined Data Memory register [m] as specified in the

instruction. The higher order table data byte from the Program Memory will be transferred to the

TBLH special register. Any unused bits in this transferred higher order byte will be read as

²0².

The following diagram illustrates the addressing/data flow of the look-up table:

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

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

R e g i s t e r T B L H

U s e r S e l e c t e d

R e g i s t e r

H i g h B y t e

L o w B y t e

L a s t p a g e o r

p r e s e n t p a g e

P C x ~ P C 8

P C H i g h B y t e

T B L P R e g i s t e r

D a t a

1 5 b i t s

P r o g r a m M e m o r y

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