void __low_power_mode_1(void);

__low_power_mode_1 enters MSP430 low power mode 1. In this mode the CPU, MCLK, and DCO are disabled; SMCLK and ACLK are active; the DC generator is disabled if the DCO is not used for MCLK or SMCLK in active mode.

__low_power_mode_1 is an intrinsic function and produces inline code.