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AT83C5103 Datasheet(PDF) 46 Page - ATMEL Corporation

Part # AT83C5103
Description  Low-pin Count 8-bit Microcontroller
PDF  64 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5103 Datasheet(HTML) 46 Page - ATMEL Corporation

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AT8xC5103
4134C–8051–09/04
Interrupt System
The AT8xC5103 has a total of 5 interrupt vectors: one external interrupt INT0, two timer
interrupts (timers 0, 1), PCA and SPI. These interrupts are shown in Figure 27..
Figure 27. 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 (see Table 31). 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 of four priority levels
by setting or clearing a bit in the Interrupt Priority register (see Table 33) and in the Inter-
rupt Priority High register (see Table 35). Table 30 shows the bit values and priority
levels associated with each combination.
IE1
0
3
High Priority
Interrupt
Interrupt
Polling
Sequence
Low Priority
Interrupt
Global
Disable
Individual
Enable
NC
NC
TF0
INT0
INT1
TF1
IPH, IP
IE0
0
3
0
3
0
3
0
3
0
3
NC
SPI
0
3
NC
0
3
0
3
CF
CCFx
PCA
NC



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