参数资料
型号: MC68HSC05K0P
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PDIP16
封装: PLASTIC, DIP-16
文件页数: 101/154页
文件大小: 1544K
代理商: MC68HSC05K0P
Technical Data
MC68HC05K0 MC68HC05K1 — Rev. 2.0
50
Interrupts
MOTOROLA
Technical Data
4.4 Interrupt Processing
To begin servicing an interrupt, the CPU:
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:
$03FC and $03FD (software interrupt vector)
$03FA and $03FB (external interrupt vector)
$03F8 and $03F9 (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.
Figure 4-3. Interrupt Stacking Order
CONDITION CODE REGISTER
$00E0 (BOTTOM OF STACK)
$00E1
$00E2
ACCUMULATOR
INDEX REGISTER
PROGRAM COUNTER (HIGH BYTE)
PROGRAM COUNTER (LOW BYTE)
$00FD
$00FE
$00FF (TOP OF STACK)
1
2
3
4
5
4
3
2
1
UNSTACKING
ORDER
STACKING
ORDER
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