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參數(shù)資料
| 型號： | μPD784218 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器) |
| 中文描述： | 8 / 16位單片機(jī)微控制器（8 / 16位單片微控制器） |
| 文件頁數(shù)： | 26/70頁 |
| 文件大小： | 271K |
| 代理商： | ΜPD784218 |
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μ
PD784217,784218
26
7.2.3 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 0FFFFH
Note
.
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
μ
PD784218 may be in the deadlock status. This deadlock status can be cleared
only by inputting the RESET signal.
Table 7-1 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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