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MN101C115 Datasheet(PDF) 83 Page - Panasonic Semiconductor |
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MN101C115 Datasheet(HTML) 83 Page - Panasonic Semiconductor |
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83 / 170 page  Chapter 4 Timer Functions 69 16-bit Timer Operation (timer 4) 4-3 16-bit Timer Operation (timer 4) 4-3-1 Overview Timer 4 is a 16-bit programmable counter that can be used as an event counter. A signal with a frequency of 1/2 of the timer 4 overflow signal can be output from the TM4IO pin. An input capture function and pulse added type PWM output function can also be used. 4-3-2 Operation s Timer Operation Settings for timer operation are listed below. (1) Set the TM4EN flag of the timer 4 mode register (TM4MD) to "0" to stop the count operation of timer 4. (2) Set the TM4CK2 to 0 flags of the TM4MD register to select fosc, fs/4, or fs/16 as the clock source. (3) Set the TM4PWM flag of the TM4MD register to "0" to select 16-bit timer operation. (4) Set a value in compare register 4 (TM4OCH, TM4OCL). (5) Set the TM4EN flag of the TM4MD register to "1" to start the timer. (6) When timer 4 begins operation, binary counter 4 counts upward from X'0000'. (7) When the value of binary counter 4 matches that of the TM4OCH and TM4OCL registers, the timer 4 interrupt request flag is set, the value of binary counter 4 is reset to X'0000', and counting begins again. When servicing an interrupt, reset the timer 4 interrupt request flag before operating timer 4. During a count operation, be careful if the value set in TM4OCH and TM4OCL is smaller than the value of binary counter 4, since the count-up operation will continue until overflow occurs. |
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