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M16C/26 датащи(PDF) 47 Page - Renesas Technology Corp |
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M16C/26 датащи(HTML) 47 Page - Renesas Technology Corp |
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47 / 239 page ![]() Power Control 41 Renesas Technology Corp. M16C/26 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER Under development Preliminary Specifications Rev. 0.9 Specifications in this manual are tentative and subject to change. Power control The following is a description of the three available power control modes: Modes Power control is available in three modes. (a) Normal operation mode • High-speed mode Divide-by-1 frequency of the main clock becomes the BCLK. The CPU operates with the BCLK. Each peripheral function operates according to its assigned clock. • Medium-speed mode Divide-by-2, divide-by-4, divide-by-8, or divide-by-16 frequency of the main clock becomes the BCLK. The CPU operates with the BCLK. Each peripheral function operates according to its assigned clock. • Low-speed mode fC becomes the BCLK. The CPU operates according to the fC clock. The fC clock is supplied by the subclock. Each peripheral function operates according to its assigned clock. • Low power dissipation mode The main clock operating in low-speed mode is stopped. The CPU operates according to the fC clock. The fC clock is supplied by the subclock. The only peripheral functions that operate are those with the subclock selected as the count source. • Ring oscillator mode The ring oscillator clock divided by 1 (undivided), 2, 4, 8, or 16 provides BCLK. The ring oscillator clock is also the clock source for the peripheral function clocks. If the sub-clock is on, fC32 can be used as the count source for timers A and B. • Ring oscillator low power dissipation mode The main clock is turned off after being placed in ring oscillator mode. The CPU clock can be selected as in the ring oscillator mode. The ring oscillator clock is the clock source for the peripheral function clocks. If the sub-clock is on, fC32 can be used as the count source for timers A and B. When the operation mode is returned to the high and medium speed modes, set the CM06 bit to “1” (divided by 8 mode). (b) Wait mode The CPU operation is stopped. The oscillators do not stop. (c) Stop mode All oscillators stop. The CPU and all built-in peripheral functions stop. This mode, among the three modes listed here, is the most effective in decreasing power consumption. Table 1.8.4. Oscillation state in each mode Figure 1.8.8 is the state transition diagram of the above modes. N I XN I C Xg n i R 8 - y b - e d i v i d ( e d o m d e e p s - m u i d e M ) d e s a e l e r t e s e r r e t f a y c n e u q e r f K L C BF F OF F O d e e p s - m u i d e m / h g i H K L C BF F O / N OF F O / N O e d o m d e e p s - w o LN O K L C BF F O e d o m n o i t a p i s s i d r e w o p w o LF F O K L C BF F O e d o m r o t a ll i c s o g n i RF F O / N OF F O / N O K L C B r e w o p w o l r o t a ll i c s o g n i R e d o m n o i t a p i s s i d F F OF F O / N O K L C B |
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