160
CHAPTER 8 LOW-POWER CONTROL CIRCUIT
Note:
If the CPU does not branch to the interrupt processing routine immediately after a return, action such
as interrupt disabling must be taken before a standby mode is set.
■
Release of the Stop Mode
The stop mode can be released by an input that has been set as an external interrupt input cause before the
system enters the stop mode. As an input cause, an "H" signal, "L" signal, rising edge, or falling edge can
be selected.
■
Oscillation Stabilization Wait Time
●
Clock oscillation stabilization wait time
Because the oscillator for oscillation is halted in the stop mode, an oscillation stabilization wait time is
required. A time period selected by the WS1 and WS0 bits of the clock selection register (CKSCR) is used
as the oscillation stabilization wait time. The WS1 and WS0 bits can be set to "00
B
" only in the main clock
mode.
●
PLL clock oscillation stabilization wait time
In main clock mode, the PLL multiplication circuit stops. When changing to PLL clock mode, it is
necessary to reserve the PLL clock oscillation stabilization wait time.
In PLL stop mode, the main clock and PLL multiplication circuit stop. During recovery from PLL stop
mode, it is necessary to allot the main clock oscillation stabilization wait time and PLL clock oscillation
stabilization wait time. The oscillation stabilization wait times for the main clock and PLL clock are
counted simultaneously according to the value specified in the oscillation stabilization wait time selection
bits (CKSCR: WS1, WS0) in the clock selection register. The oscillation stabilization wait time selection
bits (CKSCR: WS1, WS0) in the clock selection register must be selected accordingly to account for the
longer of main clock and PLL clock oscillation stabilization wait time. The PLL clock oscillation
stabilization wait time, however, requires 2
14
/HCLK or more. Set the oscillation stabilization wait time
selection bits (CKSCR: WS1, WS0) in the clock selection register to "10
B
" or "11
B
".
■
Clock Mode Switching
When the clock mode is switched, the mode should not switch to the low power consumption mode, or
other clock mode until the switching termination. To check the switching termination, the MCM bit of the
clock selection register (CKSCR) is read. The other switching to other clock mode or to low power
consumption mode may not be done before the switching termination.
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
Страница 722: ...694 APPENDIX ...
Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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