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Fabricante

80C54

8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP

Atmel Corporation 

AT/TS8xC54/8X2

10. 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 10-1.

Figure 10-1. Interrupt Control System

INT0

TF0

INT1

TF1

RI

TI

TF2

EXF2

IPH, IP

3

IE0

0

3

0

3

IE1

0

3

0

3

0

3

0

High priority

interrupt

Interrupt

polling

sequence, decreasing from

high to low priority

Individual Enable

Global Disable

Low priority

interrupt

Each of the interrupt sources can be individually enabled or disabled by setting or clearing a bit

in the Interrupt Enable register (See Table 10-2.). 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 10-3.) and in the Interrupt Pri-

ority High register (See Table 10-4.). shows the bit values and priority levels associated with

each combination.

Table 10-1. Priority Level Bit Values

IPH.x

0

0

1

1

IP.x

Interrupt Level Priority

0

0 (Lowest)

1

1

0

2

1

3 (Highest)

A low-priority interrupt can be interrupted by a high priority interrupt, but not by another low-prior-

ity interrupt. A high-priority interrupt can’t be interrupted by any other interrupt source.

25

4431E–8051–04/06

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