參數(shù)資料
型號: T89C51RD2-SMSIL
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述: 8-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQCC68
封裝: PLASTIC, LCC-68
文件頁數(shù): 45/104頁
文件大?。?/td> 798K
代理商: T89C51RD2-SMSIL
45
T89C51RD2
4243G
8051
05/03
Figure 19.
Power-down Exit Waveform
Exit from Power-down by reset redefines all the SFRs, exit from Power-down by exter-
nal interrupt 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 27
shows the state of ports during idle and power-down modes.
Port 0 can force a 0 level. A "one" will leave port floating.
INT1
INT0
XTALA
or
XTALB
Power-down Phase
Oscillator Restart Phase
Active Phase
Active Phase
Table 27.
State of Ports
Mode
Program Memory
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
1
Port Data
(1)
Port Data
Port Data
Port Data
Idle
External
1
1
Floating
Port Data
Address
Port Data
Power Down
Internal
0
0
Port Data
(1)
Port Data
Port Data
Port Data
Power Down
External
0
0
Floating
Port Data
Port Data
Port Data
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