参数资料
型号: AT80C51RD2-SLSUM
厂商: Atmel
文件页数: 53/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
标准包装: 972
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-PLCC
包装: 管件
57
4113D–8051–01/09
AT80C51RD2
Figure 14-1. Power-down Exit Waveform
Exit from power-down by reset redefines all the SFRs, exit from power-down by external inter-
rupt does no affect the SFRs.
Exit from power-down by either reset or external interrupt does not affect the internal RAM
content.
Note:
If idle mode is activated with power-down mode (IDL and PD bits set), the exit sequence is
unchanged, when execution is vectored to interrupt, PD and IDL bits are cleared and idle mode is
not entered.
Table 14-1 shows the state of ports during idle and power-down modes.
Note:
1. Port 0 can force a 0 level. A "one" will leave port floating.
INT1
INT0
XTAL
Power-down Phase
OscillatoR Restart
Active Phase
Table 14-1.
State of Ports
Mode
Program Memory
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
Port Data(1)
Port Data
Idle
External
1
Floating
Port Data
Address
Port Data
Power-down
Internal
0
Port Dat(1)
Port Data
Power-down
External
0
Floating
Port Data
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