参数资料
型号: AT89C51RB2-SLRIL
厂商: Atmel
文件页数: 107/127页
文件大小: 0K
描述: IC MCU FLASH 8051 16K 3V 44-PLCC
标准包装: 1
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
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 ~ 3.6 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: 剪切带 (CT)
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名称: AT89C51RB2SLRILCT
80
AT89C51RB2/RC2
4180E–8051–10/06
Power Management
Two power reduction modes are implemented in the AT89C51RB2/RC2: the Idle mode
and the Power-down mode. These modes are detailed in the following sections. In addi-
tion to these power reduction modes, the clocks of the core and peripherals can be
dynamically divided by 2 using the X2 mode detailed in Section “X2 Feature”.
Reset
In order to start-up (cold reset) or to restart (warm reset) properly the microcontroller, an
high level has to be applied on the RST pin. A bad level leads to a wrong initialization of
the internal registers like SFRs, Program Counter… and to unpredictable behavior of
the microcontroller. A proper device reset initializes the AT89C51RB2/RC2 and vectors
the CPU to address 0000h. RST input has a pull-down resistor allowing power-on reset
by simply connecting an external capacitor to VDD as shown in Figure 32. A warm reset
can be applied either directly on the RST pin or indirectly by an internal reset source
such as the watchdog timer. Resistor value and input characteristics are discussed in
the Section “DC Characteristics” of the AT89C51RB2/RC2 datasheet.
Figure 32. Reset Circuitry and Power-On Reset
Cold Reset
2 conditions are required before enabling a CPU start-up:
VDD must reach the specified VDD range
The level on X1 input pin must be outside the specification (V
IH, VIL)
If one of these 2 conditions are not met, the microcontroller does not start correctly and
can execute an instruction fetch from anywhere in the program space. An active level
applied on the RST pin must be maintained till both of the above conditions are met. A
reset is active when the level V
IH1 is reached and when the pulse width covers the
period of time where V
DD and the oscillator are not stabilized. 2 parameters have to be
taken into account to determine the reset pulse width:
VDD rise time,
Oscillator startup time.
To determine the capacitor value to implement, the highest value of these 2 parameters
has to be chosen. Table 1 gives some capacitor values examples for a minimum R
RST of
50 K
Ω and different oscillator startup and V
DD rise times.
R
RS
T
RST
VSS
To CPU Core
and Peripherals
RST
VDD
+
Power-on Reset
RST input circuitry
P
VDD
From Internal
Reset Source
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