HT48R01A 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT48R01A

Small Package I/O Type 8-Bit OTP MCU

Holtek Semiconductor 

HT48R01A

Table Location Bits

Instruction

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

TABRDC [m]

PC9 PC8 @7

@6

@5

@4

@3

@2

@1

@0

TABRDL [m]

1

1

@7

@6

@5

@4

@3

@2

@1

@0

Table Location

Note: PC9~PC8: Current Program Counter bits

@7~@0: Table Pointer TBLP bits

The following diagram illustrates the addressing/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 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 of the HT48R01A microcontrollers. The table

pointer is setup here to have an initial value of ²06H².

This will ensure that the first data read from the data ta-

ble 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 referenced to the first ad-

dress of the present page if the ²TABRDC [m]² instruc-

tion 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 in-

struction 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 ²306H² transferred to

; tempreg1 and TBLH

; reduce value of table pointer by one

tempreg2

:

:

300h

; 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

; sets initial address of last page

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

:

:

Rev. 1.10

9

August 4, 2008

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