參數(shù)資料
型號: AT80C51RD2-SLSUM
廠商: Atmel
文件頁數(shù): 53/81頁
文件大?。?/td> 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
標(biāo)準(zhǔn)包裝: 972
系列: 80C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器類型: ROMless
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-PLCC
包裝: 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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