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ST2202 Datasheet(PDF) 44 Page - List of Unclassifed Manufacturers

Part # ST2202
Description  8 BIT Integrated Microcontroller with 256K Bytes ROM
PDF  65 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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ST2202 Datasheet(HTML) 44 Page - List of Unclassifed Manufacturers

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Sitronix
ST2202
Ver 2.0a
44/65
2003-May-05
16.4.7 LCD Frame Rate Adjust Register
The LCD frame rate adjust register (LFRA) specifies the
extended time of each scan line. Thus the frame rate slows
down to be the desired value.
Note: LFRA must be a number greater than 4.
The adjusted frame rate for 1- and 4-bit modes can be
found in the following equations
1-bit Mode
LYMAX
LFRA
LXMAX
LCDCK
Rate
Frame
⋅
+
+
⋅
=
)
5
.
1
(
16
Equation14-1
4-bit Mode
LYMAX
LFRA
LXMAX
LCDCK
Rate
Frame
⋅
+
+
⋅
=
)
5
.
1
(
4
Equation14-2
16.4.8 LCD Frame Rate Adjust Register
Address Name
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default
$049
LFRA
W
-
-
FRA[5]
FRA[4]
FRA[3]
FRA[2]
FRA[1]
FRA[0]
- -00 0000
Bit 5~0: LFRA[5:0] : Extended time of each scan line
16.4.9 LCD AC Signal Rate Register
The LCD alternating signal rate register (LAC) specifies the time of horizontal lines the alternating signal toggles.
TABLE 16-8 LCD AC Signal Rate Register
Address Name
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default
$04A
LAC
R/W
-
-
-
AC[4]
AC[3]
AC[2]
AC[1]
AC[0]
- - -0 0000
Bit 2~0: AC[4:0] : Time of horizontal lines the AC signal toggles
AC[4:0]
AC signal
00000
Every frame
00001
Every 3 lines
00010
Every 5 lines
00011
Every 7 lines
:
:
11101
Every 59 lines
11110
Every 61 lines
11111
Every 63 lines
16.4.10 LCD PWM Contrast Control Register
The ST2202 achieves contrast control function by outputting a PWM signal from BLANK . The duty ratio of PWM signal, also
is the contrast level, is controlled by LPWM[5:0] with 64 steps.
TABLE 16-9 LCD PWM Contrast Control Register
Address Name
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default
$04B
LPWM
R/W
-
-
LPWM[5] LPWM[4] LPWM[3] LPWM[2] LPWM[1] LPWM[0] - - 00 0000
Bit 5~0: LPWM[5~0] : LCD contrast control
LPWM[5:0]
Contrast Level
00000
64 (maximum)
00001
63
00010
62
:
:
11101
3
11110
2
11111
1 (minimum)



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