Texas Instruments manual 10. MSP430x1xx Operating Modes For Basic Clock System

Operating Modes

Figure 2−10. MSP430x1xx Operating Modes For Basic Clock System

	RST/NMI	VCC On
	Reset Active
		POR
WDT		WDTIFG = 0
Time Expired, Overflow	WDTIFG = 1

	PUC	RST/NMI is Reset Pin
WDTIFG = 1
		WDT is Active

RST/NMI

WDT Active,NMI Active Security Key Violation

CPUOFF = 1

SCG0 = 0

SCG1 = 0

LPM0

CPU Off, MCLK Off,

SMCLK On, ACLK On

CPUOFF = 1

SCG0 = 1

SCG1 = 0

LPM1

CPU Off, MCLK Off,

SMCLK On, ACLK On

DC Generator Off if DCO not used in active mode

Active Mode
CPU Is Active		CPUOFF = 1
Peripheral Modules Are Active		OSCOFF = 1
		SCG0 = 1
		SCG1 = 1
		LPM4
		CPU Off, MCLK Off, DCO
		Off, ACLK Off
	CPUOFF = 1	DC Generator Off
CPUOFF = 1	SCG0 = 1
SCG0 = 0	SCG1 = 1	LPM3
SCG1 = 1
		CPU Off, MCLK Off, SMCLK
	LPM2	Off, DCO Off, ACLK On
CPU Off, MCLK Off, SMCLK
Off, DCO Off, ACLK On		DC Generator Off

SCG1	SCG0	OSCOFF	CPUOFF	Mode	CPU and Clocks Status
0	0	0	0	Active	CPU is active, all enabled clocks are active
0	0	0	1	LPM0	CPU, MCLK are disabled
					SMCLK , ACLK are active
0	1	0	1	LPM1	CPU, MCLK, DCO osc. are disabled
					DC generator is disabled if the DCO is not used for
					MCLK or SMCLK in active mode
					SMCLK , ACLK are active
1	0	0	1	LPM2	CPU, MCLK, SMCLK, DCO osc. are disabled
					DC generator remains enabled
					ACLK is active
1	1	0	1	LPM3	CPU, MCLK, SMCLK, DCO osc. are disabled
					DC generator disabled
					ACLK is active
1	1	1	1	LPM4	CPU and all clocks disabled

System Resets, Interrupts, and Operating Modes 2-15