mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 164

• Manufacturer Part Number: mc68hc908gr8a
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
14.5.1 Interrupts
At the beginning of an interrupt, the CPU saves the CPU register contents on the stack and sets the
interrupt mask (I bit) to prevent additional interrupts. At the end of an interrupt, the RTI instruction recovers
the CPU register contents from the stack so that normal processing can resume.
interrupt entry timing.
164
INTERRUPT
I BIT
INTERRUPT
R/W
I BIT
IDB
R/W
IAB
IDB
IAB
MODULE
MODULE
DUMMY
DUMMY
Figure 14-9
SP – 4
SP
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
PC – 1[7:0] PC – 1[15:8]
CCR
Figure 14-9. Interrupt Recovery Timing
Figure 14-8
SP – 3
shows interrupt recovery timing.
SP – 1
A
SP – 2
SP – 2
.
Interrupt Entry Timing
X
X
SP – 1
SP – 3
PC – 1 [7:0] PC – 1 [15:8] OPCODE
A
SP – 4
SP
CCR
VECT H
PC
V DATA H
PC + 1
VECT L
OPERAND
V DATA L
Figure 14-8
START ADDR
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