參數(shù)資料
型號: T89C51RD2-SMWC-M
廠商: Atmel Corp.
英文描述: 0 to 40MHz Flash Programmable 8-bit Microcontroller
中文描述: 0至40MHz可編程閃存8位微控制器
文件頁數(shù): 24/170頁
文件大?。?/td> 1927K
代理商: T89C51RD2-SMWC-M
24
A/T89C51CC01
4129L–CAN–08/05
Figure 9.
Power-down Exit Waveform Using INT1:0#
2.
Generate a reset.
A logic high on the RST pin clears PD bit in PCON register directly and
asynchronously. This starts the oscillator and restores the clock to the CPU
and peripherals. Program execution momentarily resumes with the
instruction immediately following the instruction that activated Power-down
mode and may continue for a number of clock cycles before the internal
reset algorithm takes control. Reset initializes the T89C51CC01 and vectors
the CPU to address 0000h.
Notes:
1. During the time that execution resumes, the internal RAM cannot be accessed; how-
ever, it is possible for the Port pins to be accessed. To avoid unexpected outputs at
the Port pins, the instruction immediately following the instruction that activated the
Power-down mode should not write to a Port pin or to the external RAM.
2. Exit from power-down by reset redefines all the SFRs, but does not affect the internal
RAM content.
INT1:0#
OSC
Power-down phase
Oscillator restart phase
Active phase
Active phase
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