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CHAPTER 6 LOW POWER CONSUMPTION MODE
6.5.1
Sleep Mode
Sleep mode causes the CPU operating clock to stop while other components continue
to operate.
When the low power consumption mode control register (LPMCR) indicates a switch to
sleep mode, a switch to PLL sleep mode occurs if PLL clock mode has been set.
Alternatively, a switch to main sleep mode occurs if main clock mode has been set.
■
Switching to Sleep Mode
Writing "1" to the SLP and TMDX bit of LPMCR and 0 to the STP bit of LPMCR triggers a switch to sleep
mode.
At this time, if the MCS bit of the clock selection register (CKSCR) is "0", the microcontroller enters PLL
sleep mode. If the MCS bit of CKSCR is "1", the microcontroller enters main sleep mode.
Note:
Since the STP/TMDX bit setting overrides the SLP bit setting when "1" is written to the SLP, STP
and "0" to TMDX bit at the same time, the mode switches to stop/time-base timer mode.
●
Data retention function
In sleep mode, the contents of dedicated registers, such as accumulators and internal RAM, are retained.
●
Operation during an interrupt request
Writing "1" to the SLP bit of LPMCR during an interrupt request does not trigger a switch to sleep mode.
If the CPU does not accept the interrupt, the CPU executes the next instruction. If the CPU accepts the
interrupt, CPU operation immediately branches to the interrupt processing routine.
●
Status of pins
During sleep mode, all pins retain the state they had immediately before the switch to sleep mode. The
once exceptions are the pins used for bus input/output or bus control.
■
Release of Sleep Mode
The low power consumption control circuit releases sleep mode. Releasing is caused by the input of a reset
or by an interrupt.
●
Return to normal mode by a reset
When sleep mode is released by a reset, the microcontroller is placed in the reset state on release from sleep
mode.
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......