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參數(shù)資料
| 型號(hào)： | IS89C51-12PL |
| 廠商： | INTEGRATED SILICON SOLUTION INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 47/48頁(yè) |
| 文件大?。?/td> | 371K |
| 代理商： | IS89C51-12PL |
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IS89C51
8
1-800-379-4774 — Integrated Silicon Solution, Inc.
MC016-1C
11/21/98
ISSI
SPECIAL FUNCTION REGISTERS
The Special Function Registers (SFR's) are located in
upper 128 Bytes direct addressing area. The SFR Memory
Map in Figure 6 shows that.
Not all of the addresses are occupied. Unoccupied
addresses are not implemented on the chip. Read accesses
to these addresses in general return random data, and
write accesses have no effect.
User software should not write 1s to these unimplemented
locations, since they may be used in future microcontrollers
to invoke new features. In that case, the reset or inactive
values of the new bits will always be 0, and their active
values will be 1.
The functions of the SFRs are outlined in the following
sections, and detailed in Table 2.
Accumulator (ACC)
ACC is the Accumulator register. The mnemonics for
Accumulator-specific instructions, however, refer to the
Accumulator simply as A.
B Register (B)
The B register is used during multiply and divide operations.
For other instructions it can be treated as another scratch
pad register.
Program Status Word (PSW). The PSW register contains
program status information.
Figure 6. Internal Data Memory and SFR Memory Map
Figure 7. Lower 128 Bytes of Internal RAM
78
70
68
60
58
50
48
40
38
30
28
20
18
10
08
00
7F
77
6F
67
5F
57
4F
47
3F
37
2F
27
1F
17
0F
07
...7F
0 ...
BANK3
BANK2
BANK 1
BANK 0
8 BYTES
REGISTER
BANKS
BIT
ADDRESSABLE
SEGMENT
SCRATCH
PAD
AREA
Accessible
by Direct
Addressing
Not
Available
in the
IS89C51
Accessible
by Direct
and Indirect
Addressing
80H
7FH
0
FFH
80H
Upper
128
Lower
128
Special
Function
Registers
Ports,
Status and
Control Bits,
Timer,
Registers,
Stack Pointer,
Accumulator
(Etc.)
B
ACC
PSW
IP
P3
IE
P2
SCON
P1
TCON
P0
Bit
Addressable
F8
F0
E8
E0
D8
D0
C8
C0
B8
B0
A8
A0
98
90
88
80
FF
F7
EF
E7
DF
D7
CF
C7
BF
B7
AF
A7
9F
97
8F
87
SBUF
TMOD
SP
TL0
DPL
TL1
DPH
TH0
TH1
PCON
相關(guān)PDF資料 |
PDF描述 |
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| IS89C51-40PQ | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| IS89LV51-12PQ | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP44 |
| IS89LV51-24WI | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP40 |
| IS89LV51-40W | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS89C51-12PLI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12PQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12PQI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12W | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| IS89C51-12WI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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