TS87C54X2 Temic Semiconductors, TS87C54X2 Datasheet - Page 24

• Manufacturer Part Number: TS87C54X2
• Description: 8-bit CMOS Microcontroller 0-60 MHz
• Manufacturer: Temic Semiconductors

TS80C54X2/C58X2
TS87C54X2/C58X2
6.5 Interrupt System
The TS80C54/58X2 has a total of 7 interrupt vectors: two external interrupts (INT0 and INT1), three timer interrupts
(timers 0, 1 and 2) and the serial port interrupt. These interrupts are shown in Figure 9.
Each of the interrupt sources can be individually enabled or disabled by setting or clearing a bit in the Interrupt
Enable register (See Table 11.). 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 (See Table 12.) and in the Interrupt Priority High register (See Table 13.).
shows the bit values and priority levels associated with each combination.
24
INT0
INT1
EXF2
TF0
TF1
TF2
RI
TI
Individual Enable
IE0
IE1
Figure 9. Interrupt Control System
IPH, IP
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
Rev. B - Aug. 31, 1999