34.3.3.6 STCS
- Store Data to Control
and Status Register Space
The STCS
instruction is used to store data to the UPDI Control and Status
register space. Data are shifted serially into the PHY layer shift register and written
as a whole byte to a selected CS register. The STCS
instruction is
based on direct addressing, where the address is part of the instruction operand. The
STCS
instruction can access only the internal UPDI register space.
This instruction supports only byte access, and the data size is not configurable.
STCS
Instruction
OperationFigure 34-14 shows the data frame transmitted after the
SYNCH character and the instruction frames. The STCS
instruction byte
can immediately be followed by the data byte. There is no response generated from the
STCS
instruction, as is the case for the ST
and
STS
instructions.