UPD784031Y データシートの表示（PDF） - NEC => Renesas Technology
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UPD784031Y Datasheet PDF : 88 Pages
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µPD784031Y
6.2.3 Special function registers (SFRs)
The special function registers, such as the mode registers and control registers of the internal peripheral hardware, are
registers to which special functions are allocated. These registers are mapped to a 256-byte space of addresses 0FF00H
through 0FFFFHNote.
Note On execution of the LOCATION 0 instruction. FFF00H through FFFFFH on execution of the LOCATION 0FH
instruction.
Caution
Do not access an address in this area to which no SFR is allocated. If such an address is accessed by
mistake, the µPD784031Y may be in the deadlock status. This deadlock status can be cleared only by
inputting the reset signal.
Table 6-1 lists the special function registers (SFRs). The meanings of the symbols in this table are as follows:
• Symbol ................................ Symbol indicating an SFR. This symbol is reserved for NEC’s assembler (RA78K4).
It can be used as an sfr variable by the #pragma sfr command with the C compiler
(CC78K4).
• R/W ..................................... Indicates whether the SFR is read-only, write-only, or read/write.
R/W : Read/write
R : Read-only
W : Write-only
• Bit units for manipulation .... Bit units in which the value of the SFR can be manipulated.
SFRs that can be manipulated in 16-bit units can be described as the operand
sfrp of an instruction. To specify the address of this SFR, describe an even
address.
SFRs that can be manipulated in 1-bit units can be described as the operand of a
bit manipulation instruction.
• After reset ........................... Indicates the status of the register when the RESET signal has been input.
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