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C161 Datasheet(PDF) 209 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 209 Page - Infineon Technologies AG |
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209 / 400 page  &3, 7KH*HQHUDO 3XUSRVH 7LPHU8QLWV User’s Manual 10-17 1999-08 Timer Concatenation Using the toggle bit T3OTL as a clock source for an auxiliary timer in counter mode concatenates the core timer T3 with the respective auxiliary timer. Depending on which transition of T3OTL is selected to clock the auxiliary timer, this concatenation forms a 32- bit or a 33-bit timer/counter. • 32-bit Timer/Counter: If both a positive and a negative transition of T3OTL is used to clock the auxiliary timer, this timer is clocked on every overflow/underflow of the core timer T3. Thus, the two timers form a 32-bit timer. • 33-bit Timer/Counter: If either a positive or a negative transition of T3OTL is selected to clock the auxiliary timer, this timer is clocked on every second overflow/underflow of the core timer T3. This configuration forms a 33-bit timer (16-bit core timer+T3OTL+16- bit auxiliary timer). The count directions of the two concatenated timers are not required to be the same. This offers a wide variety of different configurations. T3 can operate in timer, gated timer or counter mode in this case. Figure 10-11 Concatenation of Core Timer T3 and an Auxiliary Timer *) Note: Line only affected by over/underflows of T3, but NOT by software modifications of T3OTL. T3OUT= P3.3 x = 2,4 y = 3 Core Timer Ty TyOTL Interrupt Request TyOE TyOUT TyR 2n : 1 MCB02034 f CPU Up/Down Auxiliary Timer Tx TxR Txl Edge Select TxIR Interrupt Request *) Up/Down |
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