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Q67120-C0581 데이터시트(PDF) 28 Page - Siemens Semiconductor Group |
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Q67120-C0581 데이터시트(HTML) 28 Page - Siemens Semiconductor Group |
28 / 57 page SAB 80C515A/83C515A-5 Semiconductor Group 27 Timers /Counters The SAB 80C515A contains three 16-bit timers/counters wich are useful in many applications for timing and counting. the input clock for wach timer/counter is 1/12 of the oscillator frequency in the timer operation or can be taken from an external clock source for the counter operation (maximum count rate is 1/24 of the oscillator frequency). – Timer/Counter 0 and 1 These timers/counters can operate in four modes: Mode 0: 8-bit timer/counter with 32:1 prescaler Mode 1: 16-bit timer/counter Mode 2: 8-bit timer/counter with 8-bit auto-reload Mode 3: Timer/counter 0 is configured as one 8-bit timer/counter and one 8-bit timer; Timer/counter 1 in this mode holds its count. External inputs INTO and INT1 can be programmed to function as a gate for timer/counters 0 and 1 to facilitate pulse width measurements. – Timer/Counter 2 Timer/counter 2 of the SAB 80C515A is a 16-bit timer/counter with several additional features. It offers a 2:1 prescaler, a selectable gate function, and compare, capture and reload functions. Corresponding to the 16-bit timer register there are four 16-bit capture/compare registers, one of them can be used to perform a 16-bit reload on a timer overflow or external event. Each of these registers corresponds to a pin of port 1 for capture input/compare output. Figure 4 shows a block diagram of timer/counter 2. Reload A 16-bit reload can be performed with the 16-bit CRC register consisting of CRCL and CRCH. There are two modes from which to select: Mode 0: Reload is caused by a timer 2 overflow (auto-reload). Mode 1: Reload is caused in response to a negative transition at pin T2EX (P1.5), which can also request an interrupt. |
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