C868_02 Datasheet, PDF (195/244 Pages) Infineon Technologies AG – 8 - Bit CMOS Microcontroller

C868
Interrupt System
7.2.2 Interrupt Request Flags
The request flags for the different interrupt sources are located in several special
function registers. This section describes the locations and meanings of these interrupt
request flags in detail. .
TCON
Timer 0/1 Control Register
[Reset value: 00_H]
8F_H
8E_H
8D_H
8C_H
8B_H
8A_H
89_H
88_H
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
rwh
rw
rwh
rw
rwh
rw
rwh
rw
The functions of the shaded bits are not described here
Field
IT0
IE0
IT1
IE1
Bits Typ Description
0
rw External interrupt 0 level/edge trigger control
flag
If IT0 = 0, low level triggered external interrupt 0 is
selected.
If IT0 = 1, falling edge triggered external interrupt 0
is selected.
1
rwh External interrupt 0 request flag
Set by hardware when external interrupt 0 edge is
detected. Cleared by hardware when processor
vectors to interrupt routine.
2
rw External interrupt 1 level/edge trigger control
flag
If IT1 = 0, low level triggered external interrupt 1 is
selected.
If IT1 = 1, falling edge triggered external interrupt 1
is selected.
3
rwh External interrupt 1 request flag
Set by hardware when external interrupt 1 edge is
detected. Cleared by hardware when processor
vectors to interrupt routine.
User’s Manual
7-11
V 0.4, 2002-01