Abstract: The regulating system (150; 150?) for a timepiece movement (300) includes: an inertial element (4; 4?), a frame (6), and an elastic return system (1; 1?; 2,3) for connecting the inertial element (4; 4?) to the frame (6) such that the inertial element and the elastic return system (1; 1?,2,3) form an oscillator (100; 100?), the elastic return system (1; 1?,2,3) including: first, second and third elastic return elements (1; 1?,2,3) having first, second, and third stiffnesses k1, k2, k3, respectively, and a device (200) for modifying the third stiffness k3, the first elastic return element (1; 1?) and the second elastic return element (2) being mounted in series between the inertial element and the frame (6), and the third elastic return element (3) and the second elastic return element (2) being mounted in parallel between the frame (6) and the first elastic return element (1; 1?).

Abstract: A data communication circuit comprising a slave device (3), a master device (2) and a two-wire bus (6) wherein the master device (2) creates a potential difference (V(t)) between the two wires so as to provide power to the slave device (3). The slave device (3) comprises a pulse decoder (20) for detecting the pulses and producing a synchronisation signal (Clk) upon the detection of each pulse. The master device (2) also comprises a pulse control circuit (40) for causing the pulse creating circuit to create a series of data pulses having the same state when the digital information is read from the slave device (3). In addition, the slave device (3) further comprises a circuit (43,58) for changing the state of selected ones of the data pulses in the series in response to the digital information to be read.