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| 型号： | AT80C51RB2-3CSUM |
| 厂商： | Atmel Corp. |
| 英文描述： | 80C51 High Performance ROM 8-bit Microcontroller |
| 中文描述： | 80C51的高性能ROM的8位微控制器 |
| 文件页数： | 64/83页 |
| 文件大小： | 672K |
| 代理商： | AT80C51RB2-3CSUM |
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65
AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
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 48.
AUXR Register
AUXR - Auxiliary Register (8Eh)
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 during a MOVX or MOVC
instructione is used.
相关PDF资料 |
PDF描述 |
|---|---|
| AT80C51RB2-RLTIL | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTIM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUL | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSCM | 80C51 High Performance ROM 8-bit Microcontroller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT80C51RB2-RLTIL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTIM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTUM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-SLSCM | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
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