C501 Datasheet, PDF (22/48 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C501
Interrupt System
The C501 provides 6 interrupt sources with two priority levels. Figure 9 gives a general overview of
the interrupt sources and illustrates the request and control flags.
Timer 0 Overflow
TF0
TCON.5
ET0
PT0
IE.1
IP.1
Timer 1 Overflow
TF1
TCON.0 _TCON.7
ET1
PT1
IE.3
IP.3
Timer 2 Overflow
TF2
1
T2CON.7
P1.1/
T2EX
EXF2
ET2
PT2
T2CON.6
IE.5
IP.5
EXEN2
T2CON.3
RI
1
USART
SCON.0
TI
ES
PS
SCON.1
IE.4
IP.4
P3.2/
INT0
IT0
TCON.0
IE0
TCON.1
EX0
PX0
IE.0
IP.0
P3.3/
INT1
IT1
TCON.2
IE1
TCON.3
EX1
EA
PX1
IE.2 IE.7
IP.2
Figure 9
Interrupt Request Sources
High Priority
Low Priority
MCS01783
Semiconductor Group
22
1997-04-01