ST2202A
16.4.7 LCD Frame Rate Adjust Register
TheꢀLCDꢀframeꢀrateꢀadjustꢀregisterꢀ(LFRA)ꢀspecifiesꢀtheꢀ
extendedꢀtimeꢀofꢀeachꢀscanꢀline.ꢀThusꢀtheꢀframeꢀrateꢀslowsꢀ
downꢀtoꢀbeꢀtheꢀdesiredꢀvalue.ꢀ
ꢀ
ꢀ
ꢀ
1-bit Mode
Frame Rate =
LCDCK
16⋅(LXMAX + LFRA +1.5)⋅ LYMAX
Note:ꢀLFRAꢀmustꢀbeꢀaꢀnumberꢀgreaterꢀthanꢀ4.ꢀ
ꢀ
Equation14ꢁ1ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Theꢀadjustedꢀframeꢀrateꢀforꢀ1ꢁꢀandꢀ4ꢁbitꢀmodesꢀcanꢀbeꢀ
foundꢀinꢀtheꢀfollowingꢀequationsꢀ
ꢀ
4-bit Mode
LCDCK
Frame Rate =
4⋅(LXMAX + LFRA +1.5)⋅ LYMAX
ꢀ
Equation14ꢁ2ꢀ
ꢀ
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
Wꢀ
ꢁꢀ
ꢁꢀ
FRA[5]ꢀ FRA[4]ꢀ FRA[3]ꢀ FRA[2]ꢀ FRA[1]ꢀ FRA[0]ꢀ ꢁꢀꢁ00ꢀ0000ꢀ
ꢀ
Bitꢀ5~0:ꢀ ꢀ LFRA[5:0]ꢀ:ꢀExtendedꢀtimeꢀofꢀeachꢀscanꢀlineꢀ ꢀ
ꢀ
ꢀ
16.4.9 LCD AC Signal Rate Register
TheꢀLCDꢀalternatingꢀsignalꢀrateꢀregisterꢀ(LAC)ꢀspecifiesꢀtheꢀtimeꢀofꢀhorizontalꢀlinesꢀtheꢀalternatingꢀsignalꢀtoggles.ꢀ
ꢀ
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/Wꢀ
ꢁꢀ
ꢁꢀ
ꢁꢀ
AC[4]ꢀ
AC[3]ꢀ
AC[2]ꢀ
AC[1]ꢀ
AC[0]ꢀ ꢁꢀꢁꢀꢁ0ꢀ0000ꢀ
ꢀ
Bitꢀ2~0:ꢀ ꢀ AC[4:0]ꢀ:ꢀTimeꢀofꢀhorizontalꢀlinesꢀtheꢀACꢀsignalꢀtogglesꢀ
AC[4:0]
00000
00001ꢀ
00010ꢀ
00011ꢀ
:ꢀ
ACꢀsignalꢀ
Everyꢀframeꢀ
Everyꢀ3ꢀlinesꢀ
Everyꢀ5ꢀlinesꢀ
Everyꢀ7ꢀlinesꢀ
:ꢀ
11101ꢀ
11110ꢀ
11111ꢀ
Everyꢀ59ꢀlinesꢀ
Everyꢀ61ꢀlinesꢀ
Everyꢀ63ꢀlinesꢀ
ꢀ
ꢀ
16.4.10 LCD PWM Contrast Control Register
TheꢀST2202ꢀachievesꢀcontrastꢀcontrolꢀfunctionꢀbyꢀoutputtingꢀaꢀPWMꢀsignalꢀfromꢀ
.ꢀTheꢀdutyꢀratioꢀofꢀPWMꢀsignal,ꢀalsoꢀ
BLANK
isꢀtheꢀcontrastꢀlevel,ꢀisꢀcontrolledꢀbyꢀLPWM[5:0]ꢀwithꢀ64ꢀsteps.ꢀ
ꢀ
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/Wꢀ
ꢁꢀ
ꢁꢀ
LPWM[5]ꢀ LPWM[4]ꢀ LPWM[3]ꢀ LPWM[2]ꢀ LPWM[1]ꢀ LPWM[0]ꢀ ꢁꢀꢁꢀ00ꢀ0000ꢀ
ꢀ
Bitꢀ5~0:ꢀLPWM[5~0] :ꢀLCDꢀcontrastꢀcontrolꢀ
LPWM[5:0]
00000
00001ꢀ
00010ꢀ
:ꢀ
ContrastꢀLevelꢀ
64ꢀ(maximum)ꢀ
63ꢀ
62ꢀ
:ꢀ
11101ꢀ
11110ꢀ
3ꢀ
2ꢀ
11111ꢀ
1ꢀ(minimum)ꢀ
ꢀ
ꢀ
Verꢀ2.5ꢀ
45
/75
ꢀ
9/16/2008ꢀ
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
