BS85B12-3/BS85C20-3/BS85C20-5
Touch Key Flash MCU with LCD/LED Driver
Coꢀnter Valꢀe
CCR�
Coꢀnter Cleared
by CCR�
TnDPX = 1; TnM [1:0] = 10
Coꢀnter reset
when TnON
retꢀrns hiꢁh
Coꢀnter Stop
if TnON bit low
Paꢀse Resꢀme
CCRP
Time
TnON
TnP�U
TnPOL
CCR� Int.
Flaꢁ Tn�F
CCRP Int.
Flaꢁ TnPF
TM O/P Pin
TnOC = 1
TM O/P Pin
TnOC = 0
PWM resꢀmes
operation
PWM Dꢀty Cycle
set by CCRP
Oꢀtpꢀt Inverts
When TnPOL = 1
Oꢀtpꢀt controlled by
other pin-shared fꢀnction
PWM Period
set by CCR�
PWM Mode – TnDPX = 1
Note:ꢀ1.ꢀHereꢀTnDPX=1ꢀ–ꢀCounterꢀclearedꢀbyꢀCCRA
2.ꢀAꢀcounterꢀclearꢀsetsꢀtheꢀPWMꢀPeriod
3.ꢀTheꢀinternalꢀPWMꢀfunctionꢀcontinuesꢀevenꢀwhenꢀTnIOꢀ[1:0]ꢀ=ꢀ00ꢀorꢀ01
4.ꢀTheꢀTnCCLRꢀbitꢀhasꢀnoꢀinfluenceꢀonꢀPWMꢀoperation
Single Pulse Mode
Toꢀselectꢀthisꢀmode,ꢀbitsꢀTnM1ꢀandꢀTnM0ꢀinꢀtheꢀTMnC1ꢀregisterꢀshouldꢀbeꢀsetꢀtoꢀ10ꢀrespectivelyꢀ
andꢀalsoꢀtheꢀTnIO1ꢀandꢀTnIO0ꢀbitsꢀshouldꢀbeꢀsetꢀtoꢀ11ꢀrespectively.ꢀTheꢀSingleꢀPulseꢀOutputꢀMode,ꢀ
asꢀtheꢀnameꢀsuggests,ꢀwillꢀgenerateꢀaꢀsingleꢀshotꢀpulseꢀonꢀtheꢀTMꢀoutputꢀpin.
TheꢀtriggerꢀforꢀtheꢀpulseꢀoutputꢀleadingꢀedgeꢀisꢀaꢀlowꢀtoꢀhighꢀtransitionꢀofꢀtheꢀTnONꢀbit,ꢀwhichꢀcanꢀ
beꢀimplementedꢀusingꢀtheꢀapplicationꢀprogram.ꢀHoweverꢀinꢀtheꢀSingleꢀPulseꢀMode,ꢀtheꢀTnONꢀbitꢀ
canꢀalsoꢀbeꢀmadeꢀtoꢀautomaticallyꢀchangeꢀfromꢀlowꢀtoꢀhighꢀusingꢀtheꢀexternalꢀTCKnꢀpin,ꢀwhichꢀwillꢀ
inꢀturnꢀinitiateꢀtheꢀSingleꢀPulseꢀoutput.ꢀWhenꢀtheꢀTnONꢀbitꢀtransitionsꢀtoꢀaꢀhighꢀlevel,ꢀtheꢀcounterꢀ
willꢀstartꢀrunningꢀandꢀtheꢀpulseꢀleadingꢀedgeꢀwillꢀbeꢀgenerated.ꢀTheꢀTnONꢀbitꢀshouldꢀremainꢀhighꢀ
whenꢀtheꢀpulseꢀisꢀinꢀitsꢀactiveꢀstate.ꢀTheꢀgeneratedꢀpulseꢀtrailingꢀedgeꢀwillꢀbeꢀgeneratedꢀwhenꢀtheꢀ
TnONꢀbitꢀisꢀclearedꢀtoꢀzero,ꢀwhichꢀcanꢀbeꢀimplementedꢀusingꢀtheꢀapplicationꢀprogramꢀorꢀwhenꢀaꢀ
compareꢀmatchꢀoccursꢀfromꢀComparatorꢀA.
Rev. 1.20
91
�ꢀꢁꢀst 10ꢂ 2012
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
