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AT89C51RC2-3CSIM bảng dữ liệu(PDF) 56 Page - ATMEL Corporation

tên linh kiện AT89C51RC2-3CSIM
Giải thích chi tiết về linh kiện  Microcontroller with 16K/32K Bytes Flash
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89C51RC2-3CSIM bảng dữ liệu(HTML) 56 Page - ATMEL Corporation

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AT89C51RB2/RC2
4180C–8051–12/03
Registers
A low-priority interrupt can be interrupted by a high-priority interrupt, but not by another
low-priority interrupt. A high-priority interrupt can’t be interrupted by any other interrupt
source.
Table 43. Priority Level Bit Values
If two interrupt requests of different priority levels are received simultaneously, the
request of higher-priority level is serviced. If interrupt requests of the same priority level
are received simultaneously, an internal polling sequence determines which request is
serviced. Thus within each priority level there is a second priority structure determined
by the polling sequence.
IPH. x
IPL. x
Interrupt Level Priority
0
0
0 (Lowest)
01
1
10
2
11
3 (Highest)



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