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7477 Datasheet(PDF) 186 Page - Renesas Technology Corp |
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7477 Datasheet(HTML) 186 Page - Renesas Technology Corp |
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186 / 354 page  1-169 7470/7471/7477/7478 GROUP USER’S MANUAL HARDWARE 1.17 Low-power dissipation function 1.17.3 Notes on use [Notes on use of the stop mode] 2 2 2 2 2 Clock after recovery After recovery from the stop mode by interrupt, the contents of the CPU mode register before execution of the STP instruction are held. Accordingly, if both f(XIN) and f(XCIN) were oscillating before execution of the STP instruction, the oscillation of both f(XIN) and f(XCIN) is restarted after recovery by interrupt. In the above case, if f(XIN) is set as the system clock, the oscillation stabilizing wait time for 32768 counts of the XIN pin input signal is secured at recovery from the stop mode. Note that the f(XCIN) clock may not be stabilized even after the lapse of the f(XIN) oscillation stabilizing wait time. Note: In the 7470/7477 group, the f(XCIN) is not available. 2 2 2 2 2 Interrupt processing after recovery After recovery from the stop mode, the interrupt request bit of timer 3 and timer 4 is “1.” Clear it to “0” if necessary. The interrupt request bit of timer 1 and timer 2 may also be set to “1.” Clear it to “0” as required. |
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