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AN594 bảng dữ liệu(PDF) 14 Page - STMicroelectronics

tên linh kiện AN594
Giải thích chi tiết về linh kiện  This note describes a technique for driving
PDF  28 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN594 bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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Direct LCD Drive
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;**************************************************************************
;*
TABLE SUBROUTINE
;*
;*
task : define LCD segments driver byte to load on port B
;*
TABU defines half driver byte for L.S.DIGIT
;*
TABD defines half driver byte for M.S.DIGIT
;**************************************************************************
DATALCD
LDI
DWR,3Ch
; move data/rom window to L.S.DIGIT TABLE 2
LDI
A,40H
ADD
A,TABU
LD
X,A
LD
A,(X)
LD
Y,A
; half segment driver byte is loaded
LDI
DWR,3Dh
; move data/rom window to M.S.DIGIT TABLE 1
LDI
A,40h
ADD
A,TABD
LD
X,A
LD
A,(X)
AND
A,Y
; LCD driver byte is loaded in accumulator
RET
;**************************************************************************
;*
END OF TABLE SUBROUTINE
;**************************************************************************
;**************************************************************************
;*
KEYBOARD SUBROUTINE
;*
;*
task : controls display operation
;*
searchs TOUCHU (L.S.DIGIT) & TOUCHD (M.S.DIGIT) displayed data
;*
;**************************************************************************
CLAVIER
LDI
LOOP,02h
CLAVIER1 LD
A,DRA
ANDI A,38h
CPI
A,38h
; test 2 times if some buttons are pushed
JRNZ CLAVIER2
; IF yes THEN check them ( A3 -> A5 )
DEC
LOOP
JRNZ CLAVIER1
LDI
TOUCH,0FFh
JP
CLAVIER4
; ELSE test if keyboard is changed
CLAVIER2 LD
Y,A
LD
A,DRA
ANDI A,38h
CP
A,Y
JRZ
TSTCOL
; IF check is OK , THEN determine column
LDI
TOUCH,0FFh
JP
CLAVIER4
; ELSE test if one button was pushed
TSTCOL
JRR
3,Y,COL1
; if A3 = 0 then column #1
JRR
4,Y,COL2
; if A4 = 0 then column #2
COL3
LDI
TOUCH,3
; else column #3 is selected so TOUCH <=3
JP
TSTLIGN
COL2
LDI
TOUCH,2
;column #2 so TOUCH <=2
JP
TSTLIGN
COL1
LDI
TOUCH,1
;column #1 so TOUCH <=1
ANNEX 1: Software of the ST6215x based application (Continued)



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