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HD64F36049 Datasheet(PDF) 107 Page - Renesas Technology Corp |
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HD64F36049 Datasheet(HTML) 107 Page - Renesas Technology Corp |
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107 / 562 page  Section 6 Power-Down Modes Rev. 3.00 Mar. 15, 2006 Page 75 of 526 REJ09B0060-0300 Section 6 Power-Down Modes This LSI has five modes of operation after a reset. These include a normal active mode and four power-down modes, in which power consumption is significantly reduced. The module standby function reduces power consumption by selectively halting on-chip module functions. • Active mode The CPU and all on-chip peripheral modules are operable on the system clock. The system clock frequency can be selected from φosc, φosc/8, φosc/16, φosc/32, and φosc/64. • Subactive mode The CPU and all on-chip peripheral modules are operable on the subclock. The subclock frequency can be selected from φw/2, φw/4, and φw/8. • Sleep mode The CPU halts. On-chip peripheral modules are operable on the system clock. • Subsleep mode The CPU halts. On-chip peripheral modules are operable on the subclock. • Standby mode The CPU and all on-chip peripheral modules halt. When the clock time-base function is selected, the RTC is operable. • Module standby function Independent of the above modes, power consumption can be reduced by halting on-chip peripheral modules that are not used in module units. 6.1 Register Descriptions The registers related to power-down modes are listed below. For details on the serial mode control register (SCI3_3 module standby), see section 17, Serial Communication Interface 3 (SCI3). • System control register 1 (SYSCR1) • System control register 2 (SYSCR2) • Module standby control register 1 (MSTCR1) • Module standby control register 2 (MSTCR2) • Serial Mode Control Register (SMCR) |
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