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H838532H датащи(PDF) 176 Page - Renesas Technology Corp |
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H838532H датащи(HTML) 176 Page - Renesas Technology Corp |
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176 / 508 page ![]() Section 6 ROM Rev. 1.00 May 30, 2008 Page 156 of 484 REJ09B0436-0100 6.8 Power-Down States for Flash Memory In user mode, the flash memory will operate in either of the following states: • Normal operating mode The flash memory can be read and written to at high speed. • Power-down operating mode The power supply circuit of the flash memory is partly halted and can be read under low power consumption. • Standby mode All flash memory circuits are halted. Table 6.19 shows the correspondence between the operating modes of this LSI and the flash memory. In subactive mode, the flash memory can be set to operate in power-down mode with the PDWND bit in FLPWCR. When the flash memory returns to its normal operating state from power-down mode or standby mode, a period to stabilize the power supply circuits that were stopped is needed. When the flash memory returns to its normal operating state, bits STS2 to STS0 in SYSCR1 must be set to provide a wait time of at least 20 µs, even when the external clock is being used. Table 6.19 Flash Memory Operating States Flash Memory Operating State LSI Operating State PDWND = 0 (Initial value) PDWND = 1 Active mode Normal operating mode Normal operating mode Subactive mode Power-down mode Normal operating mode Sleep mode Normal operating mode Normal operating mode Subsleep mode Standby mode Standby mode Standby mode Standby mode Standby mode Watch mode Standby mode Standby mode |
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