ST10F269Z2QX datasheet(47/161 Pages) STMICROELECTRONICS

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ST10F269Z2Qx

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xxIC (yyyyh / zzh)

SFR Area

Reset Value: - - 00h

8.4 - Exception and Error Traps List

Table 8 shows all of the possible exceptions or error conditions that can arise during run-time:

- All the class B traps have the same trap number (and vector) and the same lower priority compare to the class A traps and to the resets.

- Each class A traps has a dedicated trap number (and vector). They are prioritized in the second priority level.

- The resets have the highest priority level and the same trap number.

- The PSW.ILVL CPU priority is forced to the highest level (15) when these exceptions are serviced.

987654

3210

--------

xxIR

xxIE

ILVL

GLVL

Bit

Function

GLVL

Group Level

Defines the internal order for simultaneous requests of the same priority.

3: Highest group priority

0: Lowest group priority

ILVL

Interrupt Priority Level

Defines the priority level for the arbitration of requests.

Fh: Highest priority level

0h: Lowest priority level

xxIE

Interrupt Enable Control Bit (individually enables/disables a specific source)

‘0’: Interrupt Request is disabled

‘1’: Interrupt Request is enabled

xxIR

Interrupt Request Flag

‘0’: No request pending

‘1’: This source has raised an interrupt request

Table 8 : Trap Priorities

Exception Condition

Trap

Flag

Trap

Vector

Location

Trap

Number

Trap*

Priority

Reset Functions:

Hardware Reset

Software Reset

Watchdog Timer Overflow

RESET

00’0000h

00h

III

Class A Hardware Traps:

Non-Maskable Interrupt

Stack Overflow

Stack Underflow

NMI

STKOF

STKUF

NMITRAP

STOTRAP

STUTRAP

00’0008h

00’0010h

00’0018h

02h

04h

06h

Class B Hardware Traps:

Undefined Opcode

Protected Instruction Fault

Illegal word Operand Access

Illegal Instruction Access

Illegal External Bus Access

UNDOPC

PRTFLT

ILLOPA

ILLINA

ILLBUS

BTRAP

00’0028h

0Ah

Reserved

[002Ch - 003Ch]

[0Bh - 0Fh]

Software Traps

TRAP Instruction

Any

0000h – 01FCh

in steps of 4h

Any

[00h - 7Fh]

Current

CPU

Priority

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