CHAPTER 2 REGISTERS
User’s Manual U11047EJ3V0UM00
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2.3 Special Function Registers (SFRs)
Unlike general-purpose registers, special function registers have their own functions and are allocated to the 256-
byte area FF00H to FFFFH.
A special function register can be manipulated, like a general-purpose register, by using operation, transfer, and
bit manipulation instructions. The bit units in which one register is to be manipulated (1, 8, and 16) differ depending
on the special function register type.
The bit unit for manipulation is specified as follows.
•
1-bit manipulation
Describes a symbol reserved by the assembler for the 1-bit manipulation instruction operand (sfr.bit). This
manipulation can also be specified with an address.
•
8-bit manipulation
Describes a symbol reserved by the assembler for the 8-bit manipulation instruction operand (sfr). This
manipulation can also be specified with an address.
•
16-bit manipulation
Describes a symbol reserved by the assembler for the 16-bit manipulation instruction operand. When
addressing an address, describe an even address.
For details of the special function registers, refer to the User's Manual of each product.
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