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M38B57MC Fiches technique(PDF) 59 Page - Mitsubishi Electric Semiconductor |
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M38B57MC Fiches technique(HTML) 59 Page - Mitsubishi Electric Semiconductor |
59 / 69 page MITSUBISHI MICROCOMPUTERS 38B5 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 59 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. Fig. 71 State Transitions of System Clock CM4 : Port Xc switch bit 0: I/O port function 1: XCIN-XCOUT oscillating function CM5 : Main clock (XIN- XOUT) stop bit 0: Oscillating 1: Stopped CM6: Main clock division ratio selection bit 0: f(XIN) (High-speed mode) 1: f(XIN)/4 (Middle-speed mode) CM7: Internal system clock selection bit 0: XIN–XOUT selected (Middle-/High-speed mode) 1: XCIN–XCOUT selected (Low-speed mode) Reset CM6 CM6 CPU mode register (CPUM : address 003B 16) b7 b4 CM6 CM6 “0” “1” “0” “1” “0” “1” “0” “1” CM 4 “1” “0” CM 4 “0” “1” “0” “1” CM 5 “1” “0” “0” “1” “0” “1” “0” “1” “0” “1” CM 6 CM 6 CM 6 CM 6 CM7=0(4 MHz selected) CM6=1(middle-speed) CM5=0(XIN oscillating) CM4=0(32 kHz stopped) 1: Switch the mode by the allows shown between the mode blocks. (Do not switch between the mode directly without an allow.) 2: The all modes can be switched to the stop mode or the wait mode and return to the source mode when the stop mode or the wait mode is ended. 3: Timer operates in the wait mode. 4: When the stop mode is ended, a delay of approximately 1 ms occurs by Timer 1 in middle-/high-speed mode. 5: When the stop mode is ended, a delay of approximately 0.25 s occurs by Timer 1 in low-speed mode. 6: The example assumes that 4 MHz is being applied to the X IN pin and 32 kHz to the X CIN pin. φ indicates the internal system clock. Middle-speed mode ( φ =1 MHz) Middle-speed mode ( φ =1 MHz) CM7=0(4 MHz selected) CM6=0(high-speed) CM5=0(XIN oscillating) CM4=0(32 kHz stopped) High-speed mode ( φ =4 MHz) CM7=0(4 MHz selected) CM6=0(high-speed) CM5=0(XIN oscillating) CM4=1(32 kHz oscillating) High-speed mode ( φ =4 MHz) CM7=1(32 kHz selected) CM6=0(high-speed) CM5=0(XIN oscillating) CM4=1(32 kHz oscillating) Low-speed mode ( φ =16 kHz) CM7=1(32 kHz selected) CM6=0(high-speed) CM5=1(XIN stopped) CM4=1(32 kHz oscillating) CM7=0(4 MHz selected) CM6=1(middle-speed) CM5=0(XIN oscillating) CM4=1(32 kHz oscillating) CM7=1(32 kHz selected) CM6=1(middle-speed) CM5=0(XIN oscillating) CM4=1(32 kHz oscillating) Low-speed mode ( φ =16 kHz) CM7=1(32 kHz selected) CM6=1(middle-speed) CM5=1(XIN stopped) CM4=1(32 kHz oscillating) Low-power dissipation mode ( =16 kHz) φ Low-power dissipation mode ( =16 kHz) φ Notes |
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Description similaire - M38B57MC |
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