mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 165
mc68hc908gr8a
Manufacturer Part Number
mc68hc908gr8a
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GR8A.pdf
(260 pages)
- Current page: 165 of 260
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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
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
AS EXIST ON CHIP
YES
Figure 14-10. Interrupt Processing
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
165
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