參數(shù)資料
型號(hào): GMS87C7216LQ
廠商: Electronic Theatre Controls, Inc.
元件分類(lèi): 數(shù)學(xué)處理器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁(yè)數(shù): 75/121頁(yè)
文件大?。?/td> 1645K
代理商: GMS87C7216LQ
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GMS81C7208/7216
FEB. 2005 Ver 1.04
71
used to store display data and data memory for which the
address are not connected to LCD can be used to store or-
dinary user’s processing data.
Blanking
Blanking is applied by setting LCDEN (bit 7 of LCR) to “0” and
turns off the LCD by outputting the non light operation level to
the COM pin. When setting Frame frequency or changing operat-
ing mode, LCD display should be off before operation, to prevent
display flickering.
18.5 Control Method of LCD Driver
Initial Setting
Flow chart of initial setting is shown in Figure 18-8.
Example: When operating with 1/4 duty LCD using a
frame frequency of 512Hz.
.
Figure 18-8 Initial Setting of LCD Driver
Figure 18-9 Example of Connection COM & SEG
Display Data Setting
Normally, display data are kept permanently in the pro-
gram memory and then stored at the display data area by
the table look-up instruction. This can be explained using
numerical display with 1/4 duty LCD as an example. The
COM and SEG connections to the LCD and display data
are the same as those shown is Figure 18-9. Programming
LDM
:
SETG
LDM
LCR,#0101_0001B;1/4duty, f
F
=512Hz
(f
SUB
= 32.768kHz)
RPR,#1;Select LCD Memory
;area (Page 1 = address 1XX
H
)
#0
#0 ;RAM Clear
;RAM(100H~11AH)
{X}+
#01BH
C_LCD1
LDX
C_LCD1: LDA
STA
CMPX
BNE
CLRG
:
:
SET1
:
:
LCR.5;Enable LCD display
Clear
LCD Display
Memory
Select Frame Frequency
Turn on LCD
Setting of LCD drive method
Initialize of display memory
Enable display
(Release of blanking)
SEG0
SEG1
COM3
COM0
COM1
COM2
Example: display “2”
1
1
1
0
0
1
0
1
*
*
*
*
*
*
*
*
100
H
101
H
3
1
2
0
bit 7
5
6
4
Note: * are don’t care.
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