HT46R92 데이터 시트보기 (PDF) - Holtek Semiconductor

부품명

상세내역

제조사

HT46R92

A/D Type 8-Bit MCU with 16
16 High Current LED Driver

Holtek Semiconductor 

HT46R92

The accompanying diagram illustrates the address-

ing/data flow of the look-up table:

P ro g ra m C o u n te r

H ig h B y te

TB LP

P ro g ra m

M e m o ry

TB LH

T a b le C o n te n ts H ig h B y te

S p e c ifie d b y [m ]

T a b le C o n te n ts L o w B y te

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.

tempreg1

tempreg2

mov

mov

tabrdl

dec

tabrdl

org

dc

db

?

db

?

:

:

a,06h

tblp,a

:

:

tempreg1

tblp

; temporary register #1

; temporary register #2

; initialise table pointer - note that this address

; is referenced

; to the last page or present page

; transfers value in table referenced by table pointer

; to tempregl

; data at prog. memory address ²706H² transferred to

; tempreg1 and TBLH

; reduce value of table pointer by one

tempreg2

:

:

700h

; 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

; sets initial address of last page

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

:

:

Table Location Bits

Instruction

b10 b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

TABRDC [m] PC10 PC9 PC8 @7 @6 @5 @4 @3 @2 @1 @0

TABRDL [m]

1

1

1

@7 @6 @5 @4 @3 @2 @1 @0

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.

Rev. 1.10

10

November 5, 2008

Share Link: