Rainbow Electronics AT89C5131 - Manual (Page 90)

90
AT89C5131
4136A–USB–03/03
Interrupt System
Overview The AT89C5131 has a total of 15 interrupt vectors: two external interrupts (INT0 and
INT1), three timer interrupts (timers 0, 1 and 2), the serial port interrupt, SPI interrupt,
Keyboard interrupt, USB interrupt and the PCA global interrupt. These interrupts are
shown in Figure 39.
Figure 39. Interrupt Control System
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
0
3
UEPINT
USBINT
0
3