The multiphase clock generation circuit includes a variable slew rate circuit and a phase interpolation circuit. Known potential uses include a low power sensor node radio for an ad-hoc network for military applications and medical applications such as ingestible and implantable radios, self powered radios, and medical monitoring systems such as cardiac and neural monitoring patches. A device hold position that corresponds to where the portable device is grasped by a user can be determined based at least in part on the sensor input. The memory can output data from storage registers on the data communication connections during a series of clock cycles to provide a burst of register data. , an assembly of members forming a rigid framework.