参数资料
型号: MC68HC05P9ACDW
厂商: MOTOROLA 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: 22/90页
文件大小: 285K
代理商: MC68HC05P9ACDW
GENERAL RELEASE SPECIFICATION
MC68HC05P9A
INTERRUPTS
MOTOROLA
Rev. 2.0
4-3
4.2
Timer Interrupt
Three different timer interrupt ags cause a timer interrupt when they are set and
enabled. The interrupt ags are in the timer status register (TSR), and the enable
bits are in the timer control register (TCR). Any of these interrupts will vector to
the same interrupt service routine, located at the address specied by the
contents of memory location $1FF8 and $1FF9.
From
RESET
External
Interrupt
IRQ
Internal Interrupt
Timer
I Bit
Set
Is
Load PC From:
IRQ: $1FFA-$1FFB
Timer: $1FF8-$1FF9
Set
I Bit
Stack
PC, X, A, CC
Clear IRQ
Request
Latch
Complete
Interrupt
Routine
and Execute
RTI
Fetch
Next
Instruction
Execute
Instruction
Y
N
Figure 4-1. Hardware Interrupt Flowchart
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