MC68HC908MR8 Datasheet, PDF (103/372 Pages) Motorola, Inc – Microcontrollers

System Integration Module (SIM)
Exception Control
CLI
LDA #$FF
BACKGROUND ROUTINE
INT1
PSHH
PULH
RTI
INT1 INTERRUPT SERVICE ROUTINE
INT2
PSHH
PULH
RTI
INT2 INTERRUPT SERVICE ROUTINE
Figure 7-11. Interrupt Recognition Example
7.6.1.2 SWI Instruction
The SWI instruction is a non-maskable instruction that causes an
interrupt regardless of the state of the interrupt mask (I bit) in the
condition code register.
NOTE: A software interrupt pushes PC onto the stack. A software interrupt does
not push PC – 1, as a hardware interrupt does.
7.6.2 Reset
All reset sources always have equal and highest priority and cannot be
arbitrated.
7.6.3 Status Flag Protection in Break Mode
The SIM controls whether status flags contained in other modules can
be cleared during break mode. The user can select whether flags are
protected from being cleared by properly initializing the break clear flag
enable bit (BCFE) in the SIM break flag control register (SBFCR).
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
System Integration Module (SIM)
Technical Data
103