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ST72411R Fiches technique(PDF) 43 Page - STMicroelectronics

No de pièce ST72411R
Description  8-BIT MCU WITH SMARTCARD INTERFACE, LCD DRIVER, 8-BIT TIMER, SAFE RESET AND SUPPLY MONITORING
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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LCD DRIVER (Cont’d)
5.4.5 Clock generation
Figure 35. LCD Clock Generation Diagram
The frequency divider (FS[2:0]) should be chosen
according to the input frequency and the required
frame frequency,
A compromise should be found between a suffi-
cient frame frequency display on the LCD for cor-
rect visualisation and a low frame frequency for
low consumption.
Below are the approximate LCD and frame fre-
quencies resulting from the input frequencies se-
lected using the FS[2:0] bits.
Note: The LCD frequency (fLCD) must not exceed
2kHz.
fOSC/2
3.58MHz
FS2
FS1
FS0
Ratio
fLCD
fframe
1
1
1
16384
213.5Hz
53Hz
1
1
0
8192
427Hz
109Hz
1
0
1
4096
874Hz
218.5Hz
1
0
0
2048
1.748kHz
437Hz
fOSC/2
4MHz
FS2
FS1
FS0
Ratio
fLCD
fframe
1
1
1
16384
244Hz
61Hz
1
1
0
8192
488Hz
122Hz
1
0
1
4096
977Hz
244Hz
1
0
0
2048
1.953kHz
488Hz
fOSC/2
----
FS2
FS1
FS0 LCDE
LCDCR
RATIO
DIVIDER
FS2 FS1 FS0
fLCD
fOSC/2
2MHz
FS2
FS1
FS0
Ratio
fLCD
fframe
1
1
0
8192
244Hz
61Hz
1
0
1
4096
488Hz
122Hz
1
0
0
2048
977Hz
244Hz
0
1
1
1024
1.953kHz
488Hz
fOSC/2
1MHz
FS2
FS1
FS0
Ratio
fLCD
fframe
1
0
1
4096
244Hz
61Hz
1
0
0
2048
488Hz
122Hz
0
1
1
1024
977Hz
244Hz
0
1
0
512
1.953kHz
488Hz
fOSC/2
500kHz
FS2
FS1
FS0
Ratio
fLCD
fframe
1
0
0
2048
244Hz
61Hz
0
1
1
1024
488Hz
122Hz
0
1
0
512
977Hz
244Hz
0
0
1
256
1.953kHz
488Hz
fOSC/2
225kHz
FS2
FS1
FS0
Ratio
fLCD
fframe
0
1
1
1024
244Hz
61Hz
0
1
0
512
488Hz
122Hz
0
0
1
256
977Hz
244Hz
0
0
0
128
1.953kHz
488Hz


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