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AT80C51RB2-3CSIM bảng dữ liệu(PDF) 46 Page - ATMEL Corporation

tên linh kiện AT80C51RB2-3CSIM
Giải thích chi tiết về linh kiện  80C51 High Performance ROM 8-bit Microcontroller
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT80C51RB2-3CSIM bảng dữ liệu(HTML) 46 Page - ATMEL Corporation

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AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
Registers
The PCA interrupt vector is located at address 0033H, the Keyboard interrupt vector is
located at address 004BH. All other vectors addresses are the same as standard C52
devices.
Table 32. Priority Level Bit Values
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.
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)
011
102
1
1
3 (Highest)



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