SDA6000 Datasheet, PDF (91/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Interrupt and Trap Functions
Table 5-2 (cont’d)
Exception Condition
Trap
Flag
Trap
Vector
Class B Hardware Traps:
Undefined Opcode
UNDOPC BTRAP
Protected Instruction PRTFLT BTRAP
Fault
Illegal Word Operand ILLOPA BTRAP
Access
Illegal Instruction Access ILLINA BTRAP
Illegal External Bus
ILLBUS BTRAP
Access
Reserved
–
–
Software Traps
–
–
TRAP Instruction
Vector Trap
Trap
Location Number Priority
00’0028_H 0A_H
I
00’0028_H 0A_H
I
00’0028_H 0A_H
I
00’0028_H 0A_H
I
00’0028_H 0A_H
I
[2C_H – 3C_H] [0B_H – 0F_H] –
Any
Any
Current
[00’0000_H – [00_H – 7F_H] CPU
00’01FC_H]
Priority
in steps
of 4_H
Normal Interrupt Processing and PEC Service
During each instruction cycle one out of all sources which require PEC or interrupt
processing is selected according to its interrupt priority. This prioritization of interrupts
and PEC requests is programmable in two levels. Each requesting source can be
assigned to a specific priority. A second level (called “group priority”) allows the
specification of an internal order for simultaneous requests from a group of different
sources on the same priority level. At the end of each instruction cycle the one source
request with the highest current priority will be determined by the interrupt system. This
request will then be serviced if its priority is higher than the current CPU priority in the
PSW register.
Interrupt System Register
Description Interrupt processing is controlled globally by the PSW register through a
general interrupt enable bit (IEN) and the CPU priority field (ILVL). Additionally the
different interrupt sources are controlled individually by their specific interrupt control
registers (… IC). Thus, the acceptance of requests by the CPU is determined by both
the individual interrupt control registers and the PSW. PEC services are controlled by the
respective PECCx register and the source and destination pointers, which specify the
task of the respective PEC service channel.
Users Manual
5-7
2000-06-15