参数资料
型号: AT89C51RB2-SLSUM
厂商: Atmel
文件页数: 112/127页
文件大小: 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
85
AT89C51RB2/RC2
4180E–8051–10/06
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 64. AUXR Register
AUXR - Auxiliary Register (8Eh)
7
6
5
432
10
DPU
-
M0
-
XRS1
XRS0
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7DPU
Disable Weak Pull-up
Cleared to activate the permanent weak pull up when latch data is logic 1
Set to disactive the weak pull-up.
6-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5M0
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.
3XRS1
XRAM Size
XRS1
XRS0
XRAM size
0
256 Bytes (default)
0
1
512 Bytes
1
0
768 Bytes
1
1024 Bytes
2XRS0
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.
0AO
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
instruction is used.
相关PDF资料
PDF描述
VJ1825A152JBLAT4X CAP CER 1500PF 630V 5% NP0 1825
VJ1825A152KBEAT4X CAP CER 1500PF 500V 10% NP0 1825
VE-B30-CU-B1 CONVERTER MOD DC/DC 5V 200W
ATMEGA644PA-PU IC MCU 8BIT 64KB FLASH 40DIP
VE-B2W-IY-F4 CONVERTER MOD DC/DC 5.5V 50W
相关代理商/技术参数
参数描述
AT89C51RC 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC_05 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC_08 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 32K Bytes Flash
AT89C51RC2 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/ 32K Bytes Flash
AT89C51RC2_0312 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller with 16K/32K Bytes Flash