Texas Instruments MSP430x1xx manual 1. SVS Registers, SVSCTL, SVS Control Register, VLDx

SVS Registers

6.3 SVS Registers

The SVS registers are listed in Table 6−1.

Table 6−1. SVS Registers

Register	Short Form	Register Type	Address	Initial State
SVS Control Register	SVSCTL	Read/write	055h	Reset with BOR

SVSCTL, SVS Control Register

7 6 5 4

3 2 1 0

VLDx

PORON

SVSON

SVSOP

SVSFG

rw−0 †	rw−0 †		rw−0 †	rw−0 †	rw−0 †	r	r	rw−0 †
†Reset by a brownout reset only, not by a POR or PUC.
VLDx	Bits	Voltage level detect. These bits turn on the SVS and select the nominal SVS
	7-4	threshold voltage level. See the device−specific datasheet for parameters.
		0000	SVS is off
		0001	1.9 V
		0010	2.1 V
		0011	2.2 V
		0100	2.3 V
		0101	2.4 V
		0110	2.5 V
		0111	2.65 V
		1000	2.8 V
		1001	2.9 V
		1010	3.05
		1011	3.2 V
		1100	3.35 V
		1101	3.5 V
		1110	3.7 V
		1111	Compares external input voltage SVSIN to 1.2 V.
PORON	Bit 3	POR on. This bit enables the SVSFG flag to cause a POR device reset.

0SVSFG does not cause a POR

1SVSFG causes a POR

SVSON	Bit 2	SVS on. This bit reflects the status of SVS operation. This bit DOES NOT turn
		on the SVS. The SVS is turned on by setting VLDx > 0.
		0	SVS is Off
		1	SVS is On
SVSOP	Bit 1	SVS output. This bit reflects the output value of the SVS comparator.
		0	SVS comparator output is high
		1	SVS comparator output is low
SVSFG	Bit 0	SVS flag. This bit indicates a low voltage condition. SVSFG remains set after
		a low voltage condition until reset by software or a brownout reset.
		0	No low voltage condition occurred
		1	A low condition is present or has occurred

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