EM73982 View Datasheet(PDF) - ELAN Microelectronics
Part Name
Description
MFG CO.
'EM73982' PDF : 41 Pages View PDF
EM73982
4-BIT MICROCONTROLLER
Read automatically the display data from the display data area and send to the LCD driver by the hardware.
Therefore, the display patterns can be changed only by overwritting the contents of the display data area
with the software.
The data memory which is not used to store the LCD display data and the addresses are not connected to the
LCD can be used to store the ordinary user's processing data.
PROGRAM EXAMPLE:
LDIA #1100B ; LCD display enable
OUTA P27
LDIA #1010B
STA 24H
(3) LCD waveform :
S
E
G
0
COM0
COM7
: ON
: OFF
* TYPE A, modify 1/4 bias :
COM0
VDD
V4
V3
V2
V1
VSS
COM1
* TYPE B, modify 1/4 bias :
COM0
VDD
V4
V3
V2
V1
VSS
COM1
BIAS
VDD
V4
V3
V2
V1
VSS
Modify 1/4 1/4
1
1
17/23
12/23
3/4
11/23
1/2
6/23
1/4
0
0
SEG0
SEG0-COM0
ON
SEG0-COM1
SEG0
SEG0-COM0
ON
SEG0-COM1
OFF
Frame freq.=65Hz
* TYPE A, 1/4 bias :
COM0
VDD
V3
V2
V1
VSS
COM1
OFF
Frame freq.
=65Hz
* TYPE B, 1/4 bias :
COM0
VDD
V3
V2
V1
VSS
COM1
SEG0
COM1
SEG0-COM0
ON
SEG0-COM0
OFF
Frame freq.=65Hz
* This specification are subject to be changed without notice.
SEG0-COM0
ON
SEG0-COM1
ON
Frame freq.
=65Hz
11.30.2001 22
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