mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 163

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Interrupts are latched, and arbitration is performed in the SIM at the start of interrupt processing. The
arbitration result is a constant that the CPU uses to determine which vector to fetch. Once an interrupt is
latched by the SIM, no other interrupt can take precedence, regardless of priority, until the latched
interrupt is serviced (or the I bit is cleared). See
Freescale Semiconductor
AS MANY INTERRUPTS
AS EXIST ON CHIP
YES
Figure 14-10. Interrupt Processing
MC68HC908GR8B Data Sheet, Rev. 3.0
INSTRUCTION?
INSTRUCTION?
INSTRUCTION
FROM RESET
INTERRUPT?
FETCH NEXT
INTERRUPT?
I BIT SET?
I BIT SET?
BREAK
SWI
IRQ
RTI
NO
NO
NO
NO
NO
Figure
YES
YES
YES
YES
14-10.
LOAD PC WITH INTERRUPT VECTOR
UNSTACK CPU REGISTERS
EXECUTE INSTRUCTION
STACK CPU REGISTERS
SET I BIT
Exception Control
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