Conclusion
Note that although other manufacturers’ products are used in
the examples, this application note does not imply specific
endorsement, or warranty of other manufacturer's products by
OSRAM. The interface schemes shown demonstrate the sim-
plicity of using the DLO4135/DLG4137 dot matrix Intelligent Dis-
Program Listing
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play. Slight timing differences may be encountered for various
microprocessors, but can be resolved using similar methods as
those used when using interfacing microprocessors with various
RAMs. The techniques used in the examples were shown for
their generality. The user will undoubtedly invent other schemes
to optimize his particular system to its requirements.
; BY DAN WATSON
; TO DO LAMP TEST, SET 100% BRIGHTNESS
; AND WRITE ‘SIEMENS*’
; P3.0 = BLO\
; P3.1 = BL1\
; P3.2 = LT\
; P3.6 = WR\
; RO = DIGIT ADDRESS ( CHIP ENABLES – CE\ )
; R1 = DIGIT COUNTER
; R7 = R6 = R5 = WAIT REGISTERS
0000
0000
0003
0006
0009
000C
000F
0010
0011
0013
0015
0017
001A
001B
001C
001D
001E
001F
0021
0022
0024
0024
0024
0026
0027
0029
002A
002C
002D
002F
0030
0032
0033
0035
0036
0037
003C
003F
003F
.ORG 00H
INIT:JMP BEGIN
BEGIN:CALL WAIT1
MOV P3,#00H
CALL WAIT1
MOV P3,#07H
NOP
NOP
MOV R0,#00H
MOV R1,#08H
MOV A,#00H
MOV DPTR,#TEXT
WRT:MOVC A,@A+DPTR
MOVX @R0,A
INC DPTR
INC R0
CLR A
DJNZ R1,WRT
GO:NOP
JMP GO
02
12
75
12
75
00
00
78
79
74
90
93
F2
A3
08
E4
D9
00
01
00
00
B0
00
B0
03
24
00
24
07
;
;
;
;
DELAY FOR uC TO STABILIZE
LAMP TEST
DISPLAY LT\ FOR A WHILE
SET ALL 8 DISPLAYS TO 100% BRT
00
08
00
00 37
;
;
;
;
;
;
;
;
DIGIT 7 ADDRESS
8 DIGIT COUNTER
CLEAR ACC.
ADDRESS OF THE MESSAGE
LOAD FIRST CHAR. INTO THE ACC.
DIGIT ADDRESS AND DATA WRITE
NEXT CHARACTER ADDRESS
NEXT DIGIT (6) ADDRESS
F9
21
; WRITE ALL 8 CHAR.
; MESSAGE ALWAYS ON
7F 88
00
7E FF
00
7D FF
00
DD FE
00
DE F8
00
DF F2
00
22
53 49 45 4D 45
4E 53 2A
.END
WAIT1:MOV R7,#88H
NOP
WAIT2:MOV R6,#FFH
NOP
WAIT3:MOV R5,#FFH
NOP
DJNZ R5,$
NOP
DJNZ R6,WAIT3
NOP
DJNZ R7,WAIT2
NOP
RET
TEXT:DB ‘SIEMENS*’
; DELAY LOOPS
2000 Infineon Technologies Corp. • Optoelectronics Division • San Jose, CA
www.infineon.com/opto • 1-888-Infineon (1-888-463-4636)
OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany
www.osram-os.com • +49-941-202-7178
Appnote 28
4
May 31, 2000-13
OSRAM [ OSRAM GMBH ]
