參數(shù)資料
型號： MC68HC705P6A
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 46/130頁
文件大?。?/td> 1541K
代理商： MC68HC705P6A
Interrupts
Advance Information
MC68HC705P6A
—
Rev. 2.0
46
Interrupts
MOTOROLA
When the current instruction is completed, the processor checks all
pending hardware interrupts. If interrupts are not masked (I bit in the
condition code register is clear) and the corresponding interrupt enable
bit is set, the processor proceeds with interrupt processing. Otherwise,
the next instruction is fetched and executed. The SWI is executed the
same as any other instruction, regardless of the I-bit state.
When an interrupt is to be processed, the CPU puts the register contents
on the stack, sets the I bit in the CCR, and fetches the address of the
corresponding interrupt service routine from the vector table at locations
$1FF8 through $1FFF. If more than one interrupt is pending when the
interrupt vector is fetched, the interrupt with the highest vector location
shown in
Table 5-1
will be serviced first.
An RTI instruction is used to signify when the interrupt software service
routine is completed. The RTI instruction causes the CPU state to be
recovered from the stack and normal processing to resume at the next
instruction that was to be executed when the interrupt took place.
Figure 5-1
shows the sequence of events that occurs during interrupt
processing.
Table 5-1. Vector Addresses for Interrupts and Reset
Register
Flag
Name
Interrupts
CPU
Interrupt
Vector
Address
N/A
N/A
Reset
RESET
$1FFE
–
$1FFF
N/A
N/A
Software
SWI
$1FFC
–
$1FFD
N/A
N/A
External Interrupt
IRQ
$1FFA
–
$1FFB
TSR
ICF
Timer Input Capture
TIMER
$1FF8
–
$1FF9
TSR
OCF
Timer Output Compare
TIMER
$1FF8
–
$1FF9
TSR
TOF
Timer Overflow
TIMER
$1FF8
–
$1FF9
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