TS80C31X2-LIB View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

TS80C31X2-LIB

8-bit CMOS Microcontroller ROMless

Atmel Corporation 

AT/TS80C31X2

10. Interrupt System

The TS80C31X2 has a total of 5 interrupt vectors: two external interrupts (INT0 and INT1), two

timer interrupts (timers 0 and 1) and the serial port interrupt. These interrupts are shown in Fig-

ure 10-1.

Figure 10-1. Interrupt Control System

INT0

TF0

INT1

TF1

RI

TI

IPH, IP

3

IE0

0

3

0

3

IE1

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.Table 10-3.). 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)

17

4428D–8051–08/05

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