TS80C51RA2 Atmel Corporation, TS80C51RA2 Datasheet - Page 39

• Manufacturer Part Number: TS80C51RA2
• Description: High Performance 8-bit Microcontroller
• Manufacturer: Atmel Corporation

Interrupt System
Figure 16. Interrupt Control System
4188A–8051–10/02
EXF2
INT0
INT1
PCA IT
TF0
TF1
TF2
RI
TI
Individual Enable
IE0
IE1
The TS80C51Rx2 has a total of 7 interrupt vectors: two external interrupts (INT0 and
INT1), three timer interrupts (timers 0, 1 and 2), the serial port interrupt and the PCA glo-
bal interrupt. These interrupts are shown in Figure 16.
WARNING: Note that in the first version of RC devices, the PCA interrupt is in the lowest
priority. Thus the order in INT0, TF0, INT1, TF1, RI or TI, TF2 or EXF2, PCA.
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 21.Table 22.). 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 (See Table 22.) and in the
Interrupt Priority High register (See Table 23.). shows the bit values and priority levels
associated with each combination.
The PCA interrupt vector is located at address 0033H. All other vector addresses are
the same as standard C52 devices.
IPH, IP
3
0
3
0
3
0
3
0
3
0
3
0
3
0
Global Disable
High priority
interrupt
Interrupt
polling
sequence, decreasing from
high to low priority
Low priority
interrupt
TS8xC51Rx2
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