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參數(shù)資料
| 型號： | T89C51RD2-SLRIM |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 49/104頁 |
| 文件大小： | 798K |
| 代理商： | T89C51RD2-SLRIM |
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49
T89C51RD2
4243G
–
8051
–
05/03
Reduced EMI Mode
The ALE signal is used to demultiplex address and data buses on port 0 when used with
external program or data memory. Nevertheless, during internal code execution, ALE
signal is still generated. In order to reduce EMI, ALE signal can be disabled by setting
AO bit.
The AO bit is located in AUXR register at bit location 0. As soon as AO is set, ALE is no
longer output but remains active during MOVX and MOVC instructions and external
fetches. During ALE disabling, ALE pin is weakly pulled high.
Table 31.
AUXR Register
AUXR - Auxiliary Register (8Eh)
7
6
5
4
Reset Value = XX0X 1000b
Not bit addressable
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
M0 bit: Pulse length in clock period
Stretch MOVX control: the RD/ and the WR/ pulse length is increased
according to the value of M0. see table 6
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
XRS1
XRS1 bit
XRAM size: Accessible size of the XRAM. See Table 6.
2
XRS0
XRS0 bit
XRAM size: Accessible size of the XRAM. Table 6.
1
EXTRAM
EXTRAM bit
See Table 6.
0
AO
ALE Output bit
Clear to restore ALE operation during internal fetches.
Set to disable ALE operation during internal fetches.
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| T89C51RD2-SLSIL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| T89C51RD2-SLRI-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SLSCL | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SLSC-L | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SLSCM | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SLSC-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
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