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AT89C51ED2-RDTIM Datasheet(PDF) 73 Page - ATMEL Corporation

No. de pieza AT89C51ED2-RDTIM
Descripción Electrónicos  8-bit Flash Microcontroller
PDF  137 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Datasheet(HTML) 73 Page - ATMEL Corporation

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AT89C51RD2/ED2
4235E–8051–04/04
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 inter-
rupt, Keyboard interrupt and the PCA global interrupt. These interrupts are shown in
Figure 36.
Figure 36. 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 54 and Table 56). 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 57) and in the
Interrupt Priority High register (Table 55 and Table 56) 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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