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SH7101 Datasheet(PDF) 77 Page - Renesas Technology Corp |
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SH7101 Datasheet(HTML) 77 Page - Renesas Technology Corp |
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77 / 560 page  Section 2 CPU Rev.1.00 Sep. 18, 2008 Page 43 of 522 REJ09B0069-0100 For a reset, the initial values of the program counter (PC) (execution start address) and stack pointer (SP) are fetched from the exception processing vector table and stored; the CPU then branches to the execution start address and execution of the program begins. For an interrupt, the stack pointer (SP) is accessed and the program counter (PC) and status register (SR) are saved to the stack area. The exception service routine start address is fetched from the exception processing vector table; the CPU then branches to that address and the program starts executing, thereby entering the program execution state. Program Execution State: In the program execution state, the CPU sequentially executes the program. Power-Down State: In the power-down state, the CPU operation halts and power consumption declines. The SLEEP instruction places the CPU in the sleep mode or the software standby mode. If the HSTBY pin is driven low when the RES pin is low, the CPU will enter the hardware standby mode. Bus Release State: In the bus release state, the CPU releases access rights to the bus to the device that has requested them. |
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