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AT89C51RC2-3CSIM bảng dữ liệu(PDF) 55 Page - ATMEL Corporation

tên linh kiện AT89C51RC2-3CSIM
Giải thích chi tiết về linh kiện  Microcontroller with 16K/32K Bytes Flash
PDF  127 Pages
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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) 55 Page - ATMEL Corporation

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AT89C51RB2/RC2
4180C–8051–12/03
Interrupt System
The AT89C51RB2/RC2 has a total of 9 interrupt vectors: two external interrupts (INT0
and INT1), three timer interrupts (timers 0, 1 and 2), the serial port interrupt, SPI inter-
rupt, Keyboard interrupt and the PCA global interrupt. These interrupts are shown in
Figure 22.
Figure 22. Interrupt Control System
Each of the interrupt sources can be individually enabled or disabled by setting or clear-
ing a bit in the Interrupt Enable register (Table 45 and Table 47). This register also
contains a global disable bit, which must be cleared to disable all interrupts at once.
Each interrupt source can also be individually programmed to one out of four priority lev-
els by setting or clearing a bit in the Interrupt Priority register (Table 48) and in the
Interrupt Priority High register (Table 46 and Table 47) shows the bit values and priority
levels associated with each combination.
IE1
0
3
High Priority
Interrupt
Interrupt
Polling
Sequence, Decreasing From
High to Low Priority
Low Priority
Interrupt
Global Disable
Individual Enable
EXF2
TF2
TI
RI
TF0
INT0
INT1
TF1
IPH, IPL
IE0
0
3
0
3
0
3
0
3
0
3
0
3
PCA IT
KBD IT
SPI IT
0
3
0
3



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