參數(shù)資料
型號(hào)： UPD784225Y
廠商： NEC Corp.
英文描述： 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16/8-BIT單晶片微控制器
文件頁(yè)數(shù)： 25/92頁(yè)
文件大小： 687K
代理商： UPD784225Y
25
μ
PD784224, 784225, 784224Y, 784225Y
Data Sheet U12376EJ1V0DS00
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 to 0FFFFH
Note
.
Note
On execution of the LOCATION 0H instruction. FFF00H to 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
μ
PD784225 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 an sfr variable by the #pragma sfr directive 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.
At reset ..............................
Indicates the status of the register when the RESET signal has been input.
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