C868_02 Datasheet, PDF (200/244 Pages) Infineon Technologies AG – 8 - Bit CMOS Microcontroller

C868
Interrupt System
SCON
Serial Channel Control Register
[Reset value: 00_H]
9F_H
9E_H
9D_H
9C_H
9B_H
9A_H
99_H
98_H
SM0
SM1
SM2
REN
TB8
RB8
TI
RI
rwh
rwh
rw
rw
rw
rw
rwh
rwh
The functions of the shaded bits are not described here
Field
RI
TI
Bits Typ Description
0
rwh Serial interface receiver interrupt flag
Set by hardware if a serial data byte has been
received. Must be cleared by software.
1
rwh Serial interface transmitter interrupt flag
Set by hardware at the end of a serial data
transmission. Must be cleared by software.
The serial interface interrupt is generated by a logical OR of flag RI and TI in SFR
SCON. Neither of these flags is cleared by hardware when the service routine is
vectored to. In fact, the service routine will normally have to determine whether it was the
receive interrupt flag or the transmission interrupt flag that generated the interrupt, and
the corresonding bit will have to be cleared by software.
User’s Manual
7-16
V 0.4, 2002-01