JAJSK91C August 2018 – June 2021 DS250DF230
PRODUCTION DATA
Many of the registers in the DS250DF230 are divided into bit fields. This allows a single register to serve multiple purposes which may be unrelated. Often, configuring the DS250DF230 requires writing a bit field that makes up only part of a register value while leaving the remainder of the register value unchanged. The procedure for accomplishing this task is to read in the current value of the register to be written, modify only the desired bits in this value, and write the modified value back to the register. Of course, if the entire register is to be changed, rather than just a bit field within the register, it is not necessary to read in the current value of the register first. In all register configuration procedures described in the following sections, this procedure must be kept in mind. In some cases, the entire register is to be modified. When only a part of the register is to be changed, however, the procedure described above must be used.
Most register bits can be read or written to. However, some register bits are constrained to specific interface instructions.
Register bits can have the following interface constraints: