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HT48RA0-3 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT48RA0-3 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 34 page  HT48RA0-3/HT48CA0-3 Rev.1.10 11 October 12, 2007 · If the TSR1.1 is cleared during the timer counting, the timer will be stopped. Once the TSR1.1 is set (1 ®0®1), the down counter will reload data from t8~t0, and then the down counter begins counting down with the new load data. · If TSR1.1 and TOEF are equal to 1 both, the timer can re-start, after new data is written to TSR0, TSR1 (t0~t8) in sequence. Note: If the contents of the Down counter is 000H, set the t9 to start the timer counting, the timer will only count 1 step. The timer output time=64/fSYS. ® [ (0+1) ´ 64/fSYS=64/fSYS ] The down counter is decremented ( -1) in the cycle of 64/fSYS. If the value of the down counter becomes ²0², the zero detector generates the timer operation end sig- nal to stop the timer operation. At this time, TOEF will be set to ²1². The output of the timer operation end signal is continued while the down counter is ²0² and the timer is stopped. The following relational expression applies be- tween the timer ¢s output time and the down counter¢s set value. Timer output time = (Set value+1) ´ 64/fSYS An example is shown below. MOV A,0FFH MOV TSR0,A MOV A,01H MOV TSR1,A SET TSR1.1 In the case above, the timer output time is as follows. (Set value+1) ´ 64/fSYS = (511+1) ´ 16ms = 8.192ms By setting the flag (t9) that enables the timer output to ²1², the timer can output its operation status from the REM pin. The REM pin can also output the carrier while the timer is in operation. Note: The carrier output results if bit 9 of the high-level period setting modulo register (CARH) is cleared ( ²0²). t 9 t 8 t 7 t 6 t 5 t 4 t 3 t 2 t 1 t 0 D o w n C o u n t e r , ( t 8 ~ t 0 ) + 1 Z e r o D e t e c t o r C a r r i e r S y n c h r o n o u s C i r c u i t C a r r i e r S i g n a l f S Y S / 6 4 t 9 C o u n t C l o c k T O E F R E M t S R 1 t S R 0 Timer Configuration R E M 8 . 1 9 2 m s R E M T i m e r O u t p u t T i m e : ( S e t v a l u e + 1 ) x 6 4 / f S Y S Timer Output when Carrier is not Output |
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