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H838532H датащи(PDF) 264 Page - Renesas Technology Corp |
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H838532H датащи(HTML) 264 Page - Renesas Technology Corp |
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264 / 508 page ![]() Section 9 Timers Rev. 1.00 May 30, 2008 Page 244 of 484 REJ09B0436-0100 Program process φw Interrupt request flag (IRRTFH, IRRTFL) Interrupt factor generation signal (Internal signal, nega-active) Overflow signal, Compare match signal (Internal signal, nega-active) Interrupt Interrupt Normal Interrupt request flag clear Interrupt request flag clear (1) (2) Figure 9.7 Clear Interrupt Request Flag when Interrupt Factor Generation Signal is Valid (4) Timer Counter (TCF) Read/Write When φw/4 is selected as the internal clock in active (high-speed, medium-speed) mode, write on TCF is impossible. And, when read TCF, as the system clock and internal clock are mutually asynchronous, TCF synchronizes with synchronization circuit. This results in a maximum TCF read value error of ±1. When read/write TCF in active (high-speed, medium-speed) mode is needed, please select internal clock except for φw/4 before read/write. In subactive mode, even φw/4 is selected as the internal clock, normal read/write TCF is possible. |
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