Chapter 4
Clock/ Mode/ Voltage Control
IV
- 18
Mode Control Function
Clock Change from SRCCLK to SOSCCLK
Figure:4.2.7 shows the clock change procedure from SRCCLK to SOSCCLK.
Figure:4.2.7 Clock Change Flow from SRCCLK to SOSCCLK
..
To change the operating clock from the internal low-speed oscillation to the external low-
speed oscillation, set the SCLKSEL bit of SCLKCNT register to "1" after setting the SOSC-
CNT bit of SCLKCNT register to "1" and the enough oscillation stabilization wait time has
elapsed.
The oscillation stabilization wait time should be determined in consultation with the manufac-
turer of oscillator.
..
Clock Change from SOSCCLK to SRCCLK
Figure:4.2.8 shows the clock change procedure from SOSCCLK to SRCCLK.
Figure:4.2.8 Clock Change Flow from SOSCCLK to SRCCLK
Start the external low-speed oscillation
SCLKCNT.SOSCCNT = 1
SCLKCNT.SOSCCNT == 1
NO
YES
SLOW mode
(SYSCLK = SRCCLK)
SLOW mode
(SYSCLK = SOSCCLK)
External low-speed oscillation
stabilization wait time
Switching the source oscillation of SCLK
SCLKCNT.SCLKSEL = 0
Start the internal low-speed oscillation
SCLKCNT.SRCCNT = 1
SCLKCNT.SRCCNT == 1
NO
YES
SLOW mode
(SYSCLK = SOSCCLK)
SLOW mode
(SYSCLK = SRCCLK)
Internal low-speed oscillation
stabilization wait time (100
µ
s)
Switching the source oscillation of SCLK
SCLKCNT.SCLKSEL = 0
Summary of Contents for MN101L Series
Page 1: ...Cover MICROCOMPUTER MN101L MN101LR05D 04D 03D 02D LSI User s Manual Pub No 21705 015E ...
Page 2: ......
Page 8: ......
Page 10: ......
Page 11: ...Contents Contents 0 ...
Page 22: ... Contents 11 ...
Page 23: ...I Chapter 1 Overview 1 ...
Page 62: ...Chapter 1 Overview I 40 Cautions for Circuit Setup ...
Page 63: ...II Chapter 2 CPU 2 ...
Page 94: ...Chapter 2 CPU II 32 Reset ...
Page 95: ...III Chapter 3 Interrupts 3 ...
Page 143: ...IV Chapter 4 Clock Mode Voltage Control 4 ...
Page 175: ...V Chapter 5 Watchdog Timer WDT 5 ...
Page 180: ...Chapter 5 Watchdog Timer WDT V 6 Operation ...
Page 181: ...VI Chapter 6 Power Supply Voltage Detection 6 ...
Page 189: ...VII Chapter 7 I O Port 7 ...
Page 248: ...Chapter 7 I O Port VII 60 Port 8 ...
Page 249: ...VIII Chapter 8 8 bit Timer 8 ...
Page 282: ...Chapter 8 8 bit Timer VIII 34 8 bit Timer Cascade Connection ...
Page 283: ...IX Chapter 9 16 bit Timer 9 ...
Page 346: ...Chapter 9 16 bit Timer IX 64 IGBT Output with Dead Time ...
Page 347: ...X Chapter 10 General Purpose Time Base Free Running Timer 10 ...
Page 361: ...XI Chapter 11 RTC Time Base Timer RTC TBT 11 ...
Page 371: ...XII Chapter 12 Real Time Clock RTC 12 ...
Page 389: ...XIII Chapter 13 Serial Interface 13 ...
Page 458: ...Chapter 13 Serial Interface XIII 70 IIC Communication ...
Page 459: ...XIV Chapter 14 DMA Controller 14 ...
Page 472: ...Chapter 14 DMA Controller XIV 14 DMA Data Transfer ...
Page 473: ...XV Chapter 15 Buzzer 15 ...
Page 479: ...XVI Chapter 16 A D Converter ADC 16 ...
Page 493: ...XVII Chapter 17 LCD 17 ...
Page 530: ...Chapter 17 LCD XVII 38 LCD Display Examples ...
Page 531: ...XVIII Chapter 18 ReRAM 18 ...
Page 538: ...Chapter 18 ReRAM XVIII 8 Command Library ...
Page 539: ...XIX Chapter 19 On Board Debugger 19 ...
Page 542: ...Chapter 19 On Board Debugger XIX 4 List of on board debugging functions ...
Page 543: ...XX Chapter 20 Appendix 20 ...