Chapter 4
Clock/ Mode/ Voltage Control
Mode Control Function
IV - 23
4.2.4
Note for Transition to STANDBY Mode
While PSW.MIE is set to "1", if it can’t be guaranteed that an interrupt for wakeup re-occurs after the transition to
STANBY mode since a maskable interrupt for wakeup has occurred before the transition to STANBY mode by
setting the CPUM register, CPU can not wake up from STANDBY mode.
Figure:4.2.13 shows the example that CPU can not wake up from STANDBY mode.
Therefore, it is necessary to prevent CPU from accepting a maskable interrupt for wakeup before the transition to
STANDBY mode.
To disable a maskable interrupt, set PSW.MIE to "0" before a maskable interrupt for wakeup occurs.
In addition, while CPUM.STOP or CPUM.HALT is set to "1", CPU returns to CPU operating mode by a
maskable interrupt for wakeup regardless of the value of PSW.MIE.
(The value of xICR.LV1-0 for an interrupt as a return factor needs to be smaller than the value of PSW.MIE.)
In this way, even if a maskable interrupt for wakeup occurs before the transition to STANDBY mode, CPU can
return to CPU operating mode by a maskable interrupt for wakeup since the interrupt is detected after the transi-
tion to STANDBY mode.
However, the interrupt processing is not executed because CPU just returns to CPU operating mode in this func-
tion. To execute the interrupt processing, it is necessary to set PSW.MIE to "1" after returning to CPU operating
mode.
Figure:4.2.14 shows the operation in STANDBY mode and the acceptance sequence of interrupt while an inter-
rupt is disabled.
When not executing the interrupt processing, it is necessary to set xICR.IR to "0" by software.
Figure:4.2.15 shows the operation in STANDBY mode and the non-acceptance sequence of interrupt while an
interrupt is disabled.
Figure:4.2.13 Example of Not Returning to CPU Operating Mode
NORMAL/SLOW
mode
Enable maskable interrupts
Enable interrupt which
triggers return
)
(
HALT/STOP
mode
Set HALT/STOP
mode
Interrupt service routine
Set xICR.IE as the return factor.
RTI
Set PSW.MIE to "1".
Watchdog timer
HLAT0/1/2/3 : conticue counting
STOP : stop counting
Return factor interrupt occured
CPU can't return the CPU operating mode,
because interrupt as the return factor is not occured again.
Содержание MN101L Series
Страница 1: ...Cover MICROCOMPUTER MN101L MN101LR05D 04D 03D 02D LSI User s Manual Pub No 21705 015E ...
Страница 2: ......
Страница 8: ......
Страница 10: ......
Страница 11: ...Contents Contents 0 ...
Страница 22: ... Contents 11 ...
Страница 23: ...I Chapter 1 Overview 1 ...
Страница 62: ...Chapter 1 Overview I 40 Cautions for Circuit Setup ...
Страница 63: ...II Chapter 2 CPU 2 ...
Страница 94: ...Chapter 2 CPU II 32 Reset ...
Страница 95: ...III Chapter 3 Interrupts 3 ...
Страница 143: ...IV Chapter 4 Clock Mode Voltage Control 4 ...
Страница 175: ...V Chapter 5 Watchdog Timer WDT 5 ...
Страница 180: ...Chapter 5 Watchdog Timer WDT V 6 Operation ...
Страница 181: ...VI Chapter 6 Power Supply Voltage Detection 6 ...
Страница 189: ...VII Chapter 7 I O Port 7 ...
Страница 248: ...Chapter 7 I O Port VII 60 Port 8 ...
Страница 249: ...VIII Chapter 8 8 bit Timer 8 ...
Страница 282: ...Chapter 8 8 bit Timer VIII 34 8 bit Timer Cascade Connection ...
Страница 283: ...IX Chapter 9 16 bit Timer 9 ...
Страница 346: ...Chapter 9 16 bit Timer IX 64 IGBT Output with Dead Time ...
Страница 347: ...X Chapter 10 General Purpose Time Base Free Running Timer 10 ...
Страница 361: ...XI Chapter 11 RTC Time Base Timer RTC TBT 11 ...
Страница 371: ...XII Chapter 12 Real Time Clock RTC 12 ...
Страница 389: ...XIII Chapter 13 Serial Interface 13 ...
Страница 458: ...Chapter 13 Serial Interface XIII 70 IIC Communication ...
Страница 459: ...XIV Chapter 14 DMA Controller 14 ...
Страница 472: ...Chapter 14 DMA Controller XIV 14 DMA Data Transfer ...
Страница 473: ...XV Chapter 15 Buzzer 15 ...
Страница 479: ...XVI Chapter 16 A D Converter ADC 16 ...
Страница 493: ...XVII Chapter 17 LCD 17 ...
Страница 530: ...Chapter 17 LCD XVII 38 LCD Display Examples ...
Страница 531: ...XVIII Chapter 18 ReRAM 18 ...
Страница 538: ...Chapter 18 ReRAM XVIII 8 Command Library ...
Страница 539: ...XIX Chapter 19 On Board Debugger 19 ...
Страница 542: ...Chapter 19 On Board Debugger XIX 4 List of on board debugging functions ...
Страница 543: ...XX Chapter 20 Appendix 20 ...
Страница 555: ...Chapter 20 Appendix Instruction map XX 13 ...