C167CS datasheet(116/517 Pages) INFINEON

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C167CS

Derivatives

Interrupt and Trap Functions

User’s Manual

5-33

V2.0, 2000-07

Note: The trap service routine must clear the respective trap flag, otherwise a new trap

will be requested after exiting the service routine. Setting a trap request flag by

software causes the same effects as if it had been set by hardware.

In the case where e.g. an Undefined Opcode trap (class B) occurs simultaneously with

an NMI trap (class A), both the NMI and the UNDOPC flag is set, the IP of the instruction

with the undefined opcode is pushed onto the system stack, but the NMI trap is

executed. After return from the NMI service routine, the IP is popped from the stack and

immediately pushed again because of the pending UNDOPC trap.

TFR

Trap Flag Register

SFR (FFACH/D6H)

Reset Value: 0000H

9876

543210

NMI STK

STK

-----

UND

OPC

---

PRT

FLT

ILL

OPA

ILL

INA

ILL

BUS

rwh

Bit

Function

ILLBUS

Illegal External Bus Access Flag

An external access has been attempted with no external bus defined.

ILLINA

Illegal Instruction Access Flag

A branch to an odd address has been attempted.

ILLOPA

Illegal Word Operand Access Flag

A word operand access (read or write) to an odd address has been attempted.

PRTFLT

Protection Fault Flag

A protected instruction with an illegal format has been detected.

UNDOPC

Undefined Opcode Flag

The currently decoded instruction has no valid C167CS opcode.

STKUF

Stack Underflow Flag

The current stack pointer value exceeds the content of register STKUN.

STKOF

Stack Overflow Flag

The current stack pointer value falls below the content of reg. STKOV.

NMI

Non Maskable Interrupt Flag

A negative transition (falling edge) has been detected on pin NMI.

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