Chapter 18: TI FLASH Studio
209
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
Column Information
Interrupt This field indicates the interrupt priority, ranging from 1-7.
The status register contains a 3-bit mask indicating the
current interrupt priority, and interrupts are inhibited for all
priority levels less or equal to the current priority.
Negative Indicates if the negative flag is set(N).
Zero Indicates if the zero flag is set(Z).
Overflow Indicates the status of the overflow flag(O).
Carry Indicates the status of the carry flag (C).
Extend Indicates the condition code for extend(X).
Trace Mode To aid in program development, the 68000 processor
includes a facility to allow tracing following each
instruction. This field is set when Trace Mode is enabled.
When tracing is enabled, an exception is forced after each
instruction is executed. Thus, a debugging program like
the TI
FLASH
Studio, can monitor the Program under test.
Supervisor Indicates if the processor is in Supervisor mode. The
processor executes instructions in one of two modes —
User mode or Supervisor mode. The User mode provides
the execution environment for the majority of application
programs. The Supervisor mode allows some additional
instructions and privileges and is used by the Operating
System and other system software.
Note:
Please refer to the M68000 8-16-32-Bit Microprocessors User’s Manual for more
information.
S
Carry
Overflow
Zero
Negative
Extend
Trace
Mode
Superviso
Mode
Interrupt
Mask
I2TI1I0XNZVCS
Carry
Overflow
Zero
Negative
Extend
Trace
Mode
Superviso
Mode
Interrupt
Mask
I2TI1I0XNZVC
Figure 18.8: Status Register
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