參數(shù)資料
型號: T89C51RD2-RLFC-L
廠商: Atmel Corp.
英文描述: 0 to 40MHz Flash Programmable 8-bit Microcontroller
中文描述: 0至40MHz可編程閃存8位微控制器
文件頁數(shù): 32/170頁
文件大小: 1927K
代理商: T89C51RD2-RLFC-L
32
A/T89C51CC01
4129L–CAN–08/05
Reset Value = X00X 1100b
Not bit addressable
Table 20.
AUXR1 Register
AUXR1 (S:A2h)
Auxiliary Control Register 1
Reset Value = XXXX 00X0b
Note:
1. ENBOOT is initialized with the invert BLJB at reset. See In-System Programming
section.
1
EXTRAM
Internal/External RAM (00h - FFh)
access using MOVX @ Ri/@ DPTR
0 - Internal XRAM access using MOVX @ Ri/@ DPTR.
1 - External data memory access.
0
A0
Disable/Enable ALE)
0 - ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if X2
mode is used)
1 - ALE is active only during a MOVX or MOVC instruction.
7
6
5
4
3
2
1
0
-
-
ENBOOT
-
GF3
0
-
DPS
Bit
Number
Bit
Mnemonic
Description
7-6
-
Reserved
The value read from these bits is indeterminate. Do not set these bits.
5
ENBOOT
(1)
Enable Boot Flash
Set this bit for map the boot Flash between F800h -FFFFh
Clear this bit for disable boot Flash.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
GF3
General-purpose Flag 3
2
0
Always Zero
This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3
flag.
1
-
Reserved for Data Pointer Extension.
0
DPS
Data Pointer Select Bit
Set to select second dual data pointer: DPTR1.
Clear to select first dual data pointer: DPTR0.
Bit
Number
Bit
Mnemonic
Description
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