参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 111/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
Resets and Interrupts
56
Resets and Interrupts
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. TOF is in the timer status register, and TOIE is in the timer control
register.
Interrupt
Processing
The CPU takes the following actions to begin servicing an interrupt:
Stores the CPU registers on the stack in the order shown in
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:
$1FFC and $1FFD (software interrupt vector)
$1FFA and $1FFB (external interrupt vector)
$1FF8 and $1FF9 (timer interrupt vector)
The return from interrupt (RTI) instruction causes the CPU to recover the
CPU registers from the stack as shown in Figure 22.
12-mc68hc05p9a
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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