參數(shù)資料
型號: T89C51SND1
廠商: Atmel Corp.
英文描述: Single Chip Microcontroller with MP3 Decoder and Man Machine Interface
中文描述: 單芯片微控制器,帶有MP3解碼器和人機界面
文件頁數(shù): 24/170頁
文件大小: 1927K
代理商: T89C51SND1
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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