參數(shù)資料
型號(hào): AT83C51RB2XXX-SLSIL
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: Microcontroller
中文描述: 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 16/81頁
文件大?。?/td> 1082K
代理商: AT83C51RB2XXX-SLSIL
17
AT80C51RD2/AT83C51Rx2
4113A–8051–09/02
Table 8.
AUXR Register
AUXR - Auxiliary Register (8Eh)
Reset Value = XX0X 00’HSB.XRAM’0b (see Table 7)
Not bit addressable
7
6
5
4
3
2
1
0
-
-
M0
-
XRS1
XRS0
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit
5
M0
Pulse length
Cleared to stretch MOVX control: the RD and the WR pulse length is 6 clock
periods (default).
Set to stretch MOVX control: the RD and the WR pulse length is 30 clock periods.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit
3
XRS1
XRAM Size
XRS1
0
0
1
1
XRS0
0
1
0
1
XRAM Size
256 bytes (default)
512 bytes
768 bytes
1024 bytes
2
XRS0
1
EXTRAM
EXTRAM bit
Cleared to access internal XRAM using MOVX @ Ri/ @ DPTR.
Set to access external memory.
Programmed by hardware after Power-up regarding Hardware Security Byte
(HSB), default setting, XRAM selected.
0
AO
ALE Output bit
Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if
X2 mode is used) (default). Set, ALE is active only if a MOVX or MOVC
instruction is used.
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