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Three states in the 1149.1 State-Machine involved in a DR-Scan that drives BSR or TDR cells – or involved in an IR-Scan that drives the 1149.1 Instruction-Register – in direct association with their named actions: Capture allows the cell to observe a signal; Shift allows a cell to pass data from one cell to another cell through a serial shift path; and Update allows a cell to transfer data from the shift path to the parallel output of the cell – this sequence of events is the fundamental basis for how 1149.1 operates. This is a specialization of the generic Capture-Shift-Update flow.
Source: IEEE 1149.1