NEC PD754144 User Manual
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CHAPTER 3 FEATURES OF ARCHITECTURE AND MEMORY MAP
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User’s Manual U10676EJ3V0UM
Figure 3-7 shows the I/O map of the
µPD754244.
The meanings of the symbols shown in this figure are as follows.
•
Symbol ............ Name indicating the address of an internal hardware unit
Can be written in operands of instructions
•
R/W ................. Indicates whether the hardware unit in question can be read or written
R/W: Read/write
R:
Read only
W:
Write only
•
Number of bits that can be manipulated .......... Indicates the bit units in which the hardware unit in question can
be manipulated
: Can be manipulated in specified units (1, 4, or 8 bits)
: Only some bits can be manipulated. For the bits that can be
manipulated, refer to Remarks.
– : Cannot be manipulated in specified units (1, 4, or 8 bits).
• Bit manipulation addressing ............................... Indicates a bit manipulation addressing mode that can be used to
manipulate the hardware unit in question in 1-bit units