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6-24 Instruction Set of the I/O Processor
The Add operation is used to increment or decrement register values (or
memory values if used in conjunction with a Memory-to-Register Move
operation) for use as loop counters.
6.5.4 Move To/From SFBR Cycles
All operations are read-modify-writes. However, two registers are
involved, one of which is always the SFBR. The possible functions of this
instruction are:
• Write one byte (value contained within the SCRIPTS instruction) into
any chip register.
• Move to/from the SFBR from/to any other register.
• Alter the value of a register with AND, OR, ADD, XOR, SHIFT LEFT,
or SHIFT RIGHT operators.
• After moving values to the SFBR, the compare and jump, call, or
similar instructions may be used to check the value.
• A Move-to-SFBR followed by a Move-from-SFBR is used to perform
a register-to-register move.