C504 SIEMENS [Siemens Semiconductor Group], C504 Datasheet - Page 30

• Manufacturer Part Number: C504
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Table 8
Interrupt Vector Addresses
Request Flags
IE0
TF0
IE1
TF1
RI + TI
TF2 + EXF2
IADC
IE2
TRF, BCERR
CT2P
CC0F-CC2F, CC0R-CC2R
CT1FP, CT1FC
–
A low-priority interrupt can itself be interrupted by a high-priority interrupt, but not by another low-
priority interrupt. A high-priority interrupt cannot be interrupted by any other interrupt source.
If two requests of different priority level are received simultaneously, the request of higher priority is
serviced. If requests of the same priority are received simultaneously, an internal polling sequence
determines which request is serviced. Thus within each priority level there is a second priority
structure determined by the polling sequence as shown in table 9.
Table 9
Interrupt Source Structure
Interrupt Source
Semiconductor Group
High Priority
External Interrupt 0
Timer 0 Interrupt
External Interrupt 1
Timer 1 Interrupt
Serial Channel
Timer 2 Interrupt
Interrupt Source
External interrupt 0
Timer 0 interrupt
External interrupt 1
Timer 1 interrupt
Serial port interrupt
Timer 2 interrupt
A/D converter interrupt
External interrupt 2
CAPCOM emergency interrupt
Compare timer 2 interrupt
Capture / compare match interrupt
Compare timer 1 interrupt
Power-down interrupt
A/D Converter
External Interrupt 2
CCU Emergency Interrupt
Compare Timer 2 Interrupt
Capture / Compare Match Interrupt
Compare Timer 1 Interrupt
30
Low Priority
Vector Address
0003 H
000B H
0013 H
001B H
0023 H
002B H
0043 H
004B H
0053 H
005B H
0063 H
006B H
007B H
Priority
High h
Low
C504