參數(shù)資料
型號: T89C51SND1
廠商: Atmel Corp.
英文描述: Single Chip Microcontroller with MP3 Decoder and Man Machine Interface
中文描述: 單芯片微控制器,帶有MP3解碼器和人機界面
文件頁數(shù): 31/170頁
文件大?。?/td> 1927K
代理商: T89C51SND1
31
A/T89C51CC01
4129L–CAN–08/05
Registers
Table 18.
PSW Register
PSW (S:D0h)
Program Status Word Register
Reset Value = 0000 0000b
Table 19.
AUXR Register
AUXR (S:8Eh)
Auxiliary Register
7
6
5
4
3
2
1
0
CY
AC
F0
RS1
RS0
OV
F1
P
Bit
Number
Bit
Mnemonic
Description
7
CY
Carry Flag
Carry out from bit 1 of ALU operands.
6
AC
Auxiliary Carry Flag
Carry out from bit 1 of addition operands.
5
F0
User Definable Flag 0.
4-3
RS1:0
Register Bank Select Bits
Refer to Table 16 for bits description.
2
OV
Overflow Flag
Overflow set by arithmetic operations.
1
F1
User Definable Flag 1
0
P
Parity Bit
Set when ACC contains an odd number of 1’s.
Cleared when ACC contains an even number of 1’s.
7
6
5
4
3
2
1
0
-
-
M0
-
XRS1
XRS0
EXTRAM
A0
Bit
Number
Bit
Mnemonic
Description
7-6
-
Reserved
The value read from these bits are indeterminate. Do not set this bit.
5
M0
Stretch MOVX control:
the RD/ and the WR/ pulse length is increased according to the value of M0.
M0
Pulse length in clock period
0
6
1
30
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3-2
XRS1-0
XRAM size:
Accessible size of the XRAM
XRS 1:0 XRAM size
0
0 256 Bytes
0 1 512 Bytes
1
0
768 Bytes
1
1
1024 Bytes (default)
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