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HT86XXX Datasheet(PDF) 21 Page - Holtek Semiconductor Inc |
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HT86XXX Datasheet(HTML) 21 Page - Holtek Semiconductor Inc |
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21 / 28 page  HT86XXX Rev. 1.00 21 November 1, 2002 Timer Counter 3 (RTC time base) The timer counter TMR3 is an 8-bit programmable count-up counter. Its counting is as the same manner as Timer Event Counter 0/1 and Timer Counter 2, but the clock source of TMR3 can be from internal instruction cycle (T1) or external 32kHz crystal which is connected to PC6 and PC7. The TMR3 ¢s clock source is deter- mined by mask option. If the 32kHz crystal is enabled, then TMR3 ¢s clock source is 32kHz which is from PC6 and PC7. If the 32kHz crystal is disabled, then TMR3 ¢s clock source is internal T1. The TMR3 is internal clock source only, i.e. (TM1,TM0)=(1,0). There is a 3-bit prescaler (TMR3S2,TMR3S1,TMR3S0) which defines different division ratio of TMR3 ¢s clock source. Label Bits Function TMR3S2, TMR3S1, TMR3S0 0~2 To define the operating clock source (TMR3S2, TMR3S1, TMR3S0) 000: clock source/2 001: clock source/4 010: clock source/8 011: clock source/16 100: clock source/32 101: clock source/64 110: clock source/128 111: clock source/256 TE 3 To define the TMR3 active edge of timer/event counter (0=active on low to high; 1=active on high to low) TON 4 To enable/disable timer counting (0=disabled; 1=enabled) ¾ 5 Unused bit, read as ²0² TM0, TM1 6 7 To define the operating mode (TM1, TM0) 01=Event count mode (external clock) 10=Timer mode (internal clock) 11=Pulse width measurement mode 00=Unused TMR3 register S y s t e m C l o c k / 4 T M 1 T M 0 T E T M 1 T M 0 T O N P u l s e W i d t h M e a s u r e m e n t M o d e C o n t r o l T i m e r / E v e n t C o u n t e r 2 P r e l o a d R e g i s t e r T i m e r / E v e n t C o u n t e r 2 L o w B y t e B u f f e r D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t G N D Timer Counter 2 S y s t e m C l o c k / 4 8 - S t a g e P r e s c a l e r T i m e r C o u n t e r 3 P r e l o a d R e g i s t e r D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t T i m e r C o u n t e r 3 T O N M a s k O p t i o n 3 2 K C r y s t a l ( T M R 3 S 2 , T M R 3 S 1 , T M R 3 S 0 ) Timer Counter 3 |
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