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| 型号： | MC38HC705J2 |
| 厂商： | Motorola, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | RTS Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 3.3V; Power: 2W; Assembly; High Power Density; Optional Continuous Short Circuit Protected; Efficiency to 85% |
| 中文描述： | M68HC05系列系列8位微控制器单元 |
| 文件页数： | 49/78页 |
| 文件大小： | 427K |
| 代理商： | MC38HC705J2 |
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MC68HC705J2
RESETS AND INTERRUPTS
MOTOROLA
5-3
5.2 Interrupts
An interrupt temporarily stops normal processing to process a particular event.
Unlike a reset, an interrupt does not stop the operation of the instruction being
executed. An interrupt takes effect when the current instruction completes its
execution. An interrupt saves the CPU registers on the stack and loads the
program counter with a user-defined interrupt vector address. The following
conditions produce an interrupt:
Timer overflow or real-time interrupt request (timer interrupts)
A logical zero applied to the IRQ pin (external interrupt)
SWI instruction (software interrupt)
The CPU does the following things to begin servicing an interrupt:
Stores the contents of the CPU registers on the stack as shown in Figure
5-2
ACCUMULATOR
CONDITION CODE REGIST
INDEX REGISTER
PROGRAM COUNTER LOW
PROGRAM COUNTER HIGH
7
0
I
R
TOWARD HIGHER ADDRESSES
(HIGHEST STACK ADDRESS IS $00
TOWARD LOWER ADDRESSES
(LOWEST STACK ADDRESS IS $0
UNSTACK
STACK
Figure 5-2. Interrupt Stacking Order
Sets the interrupt mask to prevent further interrupts
Loads the program counter with the contents of the appropriate interrupt
vector locations:
— $0FF8 and $0FF9 (timer interrupt vector)
— $0FFA and $0FFB (external interrupt vector)
— $0FFC and $0FFD (software interrupt vector)
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