C501G-1E SIEMENS [Siemens Semiconductor Group], C501G-1E Datasheet - Page 79

• Manufacturer Part Number: C501G-1E
• Description: 8-Bit Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

7
The C501 provides 6 interrupt sources with two priority levels. Four interrupts can be generated by
the on-chip peripherals (timer 0, timer 1, timer 2 and serial interface), and two interrupts may be
triggered externally (P3.2/INT0 and P3.3/INT1).
This chapter shows the interrupt structure, the interrupt vectors and the interrupt related special
function registers. Figure 7-25 gives a general overview of the interrupt sources and illustrate the
request and the control flags which are described in the next sections.
Figure 7-25
Interrupt Structure
Semiconductor Group
P1.1/
T2EX
P3.2/
INT0
P3.3/
INT1
Interrupt System
Timer 0 Overflow
Timer 1 Overflow
Timer 2 Overflow
TCON.0
TCON.2
USART
IT0
IT1
T2CON.3
EXEN2
T2CON.7
T2CON.6
TCON.0
SCON.0
SCON.1
EXF2
TF2
RI
TI
TCON.5
TCON.7
TCON.3
TCON.1
TF0
TF1
IE0
IE1
<
<
_
_
1
1
7-1
EX0
ET0
IE.3
ET2
IE.5
IE.4
IE.0
IE.1
ET1
EX1
ES
IE.2
IE.7
EA
PT0
PT2
PX0
IP.3
IP.5
IP.4
IP.0
PX1
IP.2
IP.1
PT1
PS
Interrupt System
High Priority
Low Priority
MCS01783
C501