A table lookup program

When developing the 'Speech Teaching Instrument with Pinyin', the author encountered such a requirement: determine a function value (the code of the pronunciation spelled out by these three) based on three independent variables (the key value of the initial consonant, the key value of the final consonant, and the key value of the four tones), where the values ​​of the independent variables and the function are both known, but there is no clear correspondence between them. In addition, it is required to determine whether the independent variables have corresponding function values. The conventional table lookup method cannot be used. After some research, the author compiled a table lookup program to solve this problem.

1. Table lookup requirements:

Input variables: 1 ) the key value of the initial consonant, 2 ) the key value of the final vowel, 3 ) the key value of the four tones ( varies between 47-50 ).

Output result: the code of the corresponding pronunciation.

Table lookup requirements: Determine whether there is a corresponding value based on the input. If so, output the corresponding code. If not, give a not found mark.

2. Table Lookup Procedure:

;**********************************************************************

; Double spelling processing

; Entrance : 2EH and 2DH store the initials and finals of the spelling respectively , and 2CH stores the four tones of the spelling .

; Exit : If found, return the serial number value of the sound signal in 50H , and set 06H to 1

; If not found , 06H is cleared to ''0''

; R6 is used as a total number of spelling counters

;***********************************************************************

J_XH2:

PUSH PSW

MOV R6,#0

MOV DPTR,#J_X2

J2_LP0:

INC R6

CLR A

MOVC A,@A+DPTR

CJNE A,2EH,J2_NOTEQH; take initial consonants , compare , if not equal, transfer

INC DPTR

MOVC A,@A+DPTR

CJNE A,2DH,J2_NOTEQL; if the initials are equal , the finals are not equal.

MOV A,2CH

SUBB A, #47; minus 47 ( radix , so the key value starts at ''0'' and goes from 0 to 3)

MOV R7,A; R7 is used as a four-tone key value counter

J2_LOOP:

CJNE R7,#0,J2_LOOP1; if the value in R7 is not 0, then go to loop

AJMP J2_DONE

J2_LOOP1:

INC DPTR

DEC R7

AJMP J2_LOOP

J2_DONE:; Get data

INC DPTR

CLR A

MOVC A,@A+DPTR

MOV50H,A; store number

SETB06H

AJMP J2_RET

J2_NOTE:

INC DPTR

J2_NOTEQL:

INC DPTR

INC DPTR

INC DPTR

INC DPTR

CJNE R6,#SPZS,J2_LP0; if not equal to the total number of double spellings , continue the cycle

CLR06H

J2_RIGHT:

POP PSW

RIGHT

J_X2:DB1826100101102103;zi

DB1926104105106107;ci

DB2026108109110111;si.

3. Description

Before using this program, you must know exactly how many data there are in the table and define a constant: SPZS , that is, define it as follows in the program header (assuming there are 100 data in the table):

SPZS EQU100

According to this program, it is not difficult to get the three-spelling table lookup program. The above program has been verified and proved to be running correctly.