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M3455AGC-XXXFP Datasheet(PDF) 8 Page - Renesas Technology Corp |
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M3455AGC-XXXFP Datasheet(HTML) 8 Page - Renesas Technology Corp |
8 / 148 page Rev.1.01 Feb 15, 2008 Page 8 of 146 REJ03B0224-0101 455A Group DEFINITION OF CLOCK AND CYCLE • Operation source clock The operation source clock is the source clock to operate this product. In this product, the following clocks are used. • Clock (f(XIN)) by the external ceramic resonator • Clock (f(XIN)) by the external input • Clock (f(HSOCO)) of the high-speed on-chip oscillator which is the internal oscillator • Clock (f(XCIN)) by the external quartz-crystal oscillation • Clock (f(LSOCO)) by the low-speed on-chip oscillator • System clock (STCK) The system clock is the basic clock for controlling this product. The system clock is selected by the clock control register MR shown as the table below. • Machine cycle The machine cycle is the standard cycle required to execute the instruction. • Instruction clock (INSTCK) The instruction clock is the basic clock for controlling CPU. The instruction clock (INSTCK) is a signal derived by dividing the system clock (STCK) by 3. The one instruction clock cycle generates the one machine cycle. Note 1. The f(HSOCO)/8 is selected after system is released from reset Table 7 Table Selection of system clock Register MR System clock Operation mode MR3 MR2 MR1 MR0 1 1 0 0 f(STCK) = f(HSOCO)/8 Internal frequency divided by 8 mode 1 0 0 0 f(STCK) = f(HSOCO)/4 Internal frequency divided by 4 mode 0 1 0 0 f(STCK) = f(HSOCO)/2 Internal frequency divided by 2 mode 0 0 0 0 f(STCK) = f(HSOCO) Internal frequency through mode 1 1 0 1 f(STCK) = f(XIN)/8 High-speed frequency divided by 8 mode 1 0 0 1 f(STCK) = f(XIN)/4 High-speed frequency divided by 4 mode 0 1 0 1 f(STCK) = f(XIN)/2 High-speed frequency divided by 2 mode 0 0 0 1 f(STCK) = f(XIN) High-speed through mode 1 1 1 0 f(STCK) = f(XCIN)/8 Low-speed frequency divided by 8 mode 1 0 1 0 f(STCK) = f(XCIN)/4 Low-speed frequency divided by 4 mode 0 1 1 0 f(STCK) = f(XCIN)/2 Low-speed frequency divided by 2 mode 0 0 1 0 f(STCK) = f(XCIN) Low-speed through mode 1 1 1 1 f(STCK) = f(LSOCO)/8 Internal Low-speed frequency divided by 8 mode 1 0 1 1 f(STCK) = f(LSOCO)/4 Internal Low-speed frequency divided by 4 mode 0 1 1 1 f(STCK) = f(LSOCO)/2 Internal Low-speed frequency divided by 2 mode 0 0 1 1 f(STCK) = f(LSOCO) Internal Low-speed through mode |
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