s908gr16ag4cfj Freescale Semiconductor, Inc, s908gr16ag4cfj Datasheet - Page 180

• Manufacturer Part Number: s908gr16ag4cfj
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
15.5.1 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.
180
INTERRUPT
I BIT
INTERRUPT
R/W
I BIT
IDB
R/W
IAB
IDB
IAB
MODULE
MODULE
DUMMY
DUMMY
Figure 15-9
SP – 4
SP
PC – 1[7:0] PC – 1[15:8]
CCR
Figure 15-9. Interrupt Recovery Timing
Figure 15-8
SP – 3
shows interrupt recovery timing.
SP – 1
MC68HC908GR16A Data Sheet, Rev. 1.0
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 15-8
START ADDR
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