LDCS - Load Data from Control and Status Register Space

The LDCS instruction is used to load serial readout data from the UPDI Control and the Status register space located in the DL layer into the PHY layer shift register. The LDCS instruction is based on direct addressing, where the address is part of the instruction operands. The LDCS instruction can access only the UPDI CS register space. This instruction supports only byte access, and the data size is not configurable.

Figure 1. LDCS Instruction Operation

Figure 1 shows a typical example of LDCS data transmission. A data byte from the LDCS is transmitted from the UPDI after the guard time is completed.