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H8/3003 数据表(PDF) 189 Page - Renesas Technology Corp |
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H8/3003 数据表(HTML) 189 Page - Renesas Technology Corp |
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189 / 715 page  7.4 Interrupt Source Compare match interrupts (CMI) can be generated when the refresh controller is used as an interval timer. Compare match interrupt requests are masked/unmasked with the CMIE bit of RTMCSR. 7.5 Usage Notes When using the DRAM or pseudo-static RAM refresh function, note the following points: • Refresh cycles are not executed while the bus is released, during software standby mode, and when a bus cycle is greatly prolonged by insertion of wait states. When these conditions occur, other means of refreshing are required. • If refresh requests occur while the bus is released, the first request is held and one refresh cycle is executed after the bus-released state ends. Figure 7-23 shows the bus cycles in this case. Figure 7-23 Refresh Cycles when Bus is Released ø RFSH BACK Refresh request Bus-released state Refresh cycle CPU cycle Refresh cycle 171 |
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