IC89E54/58/64

Integrated CircuitSolution Inc.

11

MC012-0C 11/16/2001

The timers/counters

Refer to IC80C32 data sheet.

The serial interface

Refer to IC80C32 data sheet.

The interrupt system

There are 8 interrupt vectors in 44 pins package and 6 interrupt vectors in 40 pins package. Eight interrupt vectors only

exist in IC89E54/58/64 series.

INT2 and INT3 are new interrupts that add on standard IC80C32. The interrupt information

shows in Table 3. The interrupt architecture shows in figure 10. External interrupt 2 and 3 control register is XICON shown

in following.

Two additional external interrupts,

INT2 and INT3, whose function are similar to those of external interrupt 0 and 1 in

the standard 80C32. The functions/status of these interrupts are determined/shown by the bits in the XICON(External

Interrupt Control) register. The XICON register is bit-addressable but is not a standard register in the 80C32. Its address

is at 0C0H. To set/clear bits in the XICON register, one can use the “SETB (/CLR) bit” instruction.

Table 3. Eight interrupt information

Interrupt Source

Vector Address

Polling Sequence

Enable Required

Interrupt Type

within priority leve

Settings

Edge/Level

External Interrupt 0

03H

0 (Highest)

IE.0

TCON.0

Timer/Counter 0

0BH

1

IE.1

-

External Interrupt 1

13H

2

IE.2

TCON.2

Timer/Counter 1

1BH

3

IE.3

-

Serial Port

23H

4

IE.4

-

Timer/Counter 2

2BH

5

IE.5

-

33H

6

XICON.2

XICON.0

3BH

7 (Lowest)

XICON.6

XICON.3

Note:

1. Interrupt 2 and interrupt 3 exist in IC89E54/58/64 44 pins package.