參數(shù)資料
型號(hào): MC68HSC05J1A
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 46/128頁
文件大小: 1620K
代理商: MC68HSC05J1A
Technical Data
MC68HC05J1A — Rev. 3.0
46
Interrupts
MOTOROLA
Interrupts
4.3.3 Timer Interrupts
The multifunction timer can generate these interrupts:
Timer overflow interrupt
Real-time interrupt
Setting the I bit in the condition code register disables timer interrupts.
4.3.3.1 Timer Overflow Interrupt
A timer overflow interrupt request occurs if the timer overflow flag, TOF,
becomes set while the timer overflow interrupt enable bit, TOIE, is also
set. See
8.3 Timer Status and Control Register
.
4.3.3.2 Real-Time Interrupt
A real-time interrupt request occurs if the real-time interrupt flag, RTIF,
becomes set while the real-time interrupt enable bit, RTIE, is also set.
See
8.3 Timer Status and Control Register
.
4.4 Interrupt Processing
The CPU takes these actions to begin servicing an interrupt:
Stores the CPU registers on the stack in the order shown
in
Figure 4-3
Sets the I bit in the condition code register to prevent further
interrupts
Loads the program counter with the contents of the appropriate
interrupt vector locations:
$07FC and $07FD (software interrupt vector)
$07FA and $07FB (external interrupt vector)
$07F8 and $07F9 (timer interrupt vector)
The return-from-interrupt (RTI) instruction causes the CPU to recover
the CPU registers from the stack as shown in
Figure 4-3
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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