EM73962A
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 : (1/5 bias)
(3) LCD waveform :
S
E
G
0
* TYPE A, modify 1/4 bias :
COM0
* TYPE B, modify 1/4 bias :
COM0
VDD
V4
VDD
V4
COM0
: ON
V3
V3
V2
V2
V1
: OFF
V1
VSS
VSS
COM1
SEG0
COM1
SEG0
COM7
BIAS
Modify 1/4
1/4
1
VDD / VDD
V4 / VDD
V3 / VDD
V2 / VDD
V1 / VDD
VSS = 0
1
17/23
12/23
11/23
6/23
0
SEG0-COM0
ON
SEG0-COM0
ON
3/4
1/2
1/4
0
SEG0-COM1
OFF
SEG0-COM1
OFF
Frame freq.
=65Hz
Frame freq.=65Hz
* TYPE A, 1/4 bias :
COM0
* TYPE B, 1/4 bias :
COM0
VDD
VDD
V3
V3
V2
V2
V1
V1
VSS
VSS
COM1
SEG0
COM1
COM1
SEG0-COM0
ON
SEG0-COM0
ON
SEG0-COM0
SEG0-COM1
ON
OFF
Frame freq.
=65Hz
Frame freq.=65Hz
* This specification are subject to be changed without notice.
10.8.2001
20
ELAN [ ELAN MICROELECTRONICS CORP ]
