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AT89C51ED2-RDTUM bảng dữ liệu(PDF) 72 Page - ATMEL Corporation

tên linh kiện AT89C51ED2-RDTUM
Giải thích chi tiết về linh kiện  8-bit Flash Microcontroller
PDF  137 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89C51ED2-RDTUM bảng dữ liệu(HTML) 72 Page - ATMEL Corporation

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4235K–8051–05/08
AT89C51RD2/ED2
17. Interrupt System
The AT89C51RD2/ED2 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 interrupt, Keyboard
interrupt and the PCA global interrupt. These interrupts are shown in Figure 17-1.
Figure 17-1. Interrupt Control System
Each of the interrupt sources can be individually enabled or disabled by setting or clearing a bit
in the Interrupt Enable register (Table 17-4 and Table 17-6). 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 levels by
setting or clearing a bit in the Interrupt Priority register (Table 17-7) and in the Interrupt Priority
High register (Table 17-5 and Table 17-6) 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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