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| 型號： | MC68HC705RC16P |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 52/120頁 |
| 文件大?。?/td> | 3565K |
| 代理商： | MC68HC705RC16P |
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Interrupts
Reset Interrupt Sequence
MC68HC705RC16 — Rev. 3.0
General Release Specification
Interrupts
NON-DISCLOSURE
AGREEMENT
REQUIRED
The M68HC05 CPU does not support interruptible instructions. The
maximum latency to the first instruction of the interrupt service routine
must include the longest instruction execution time plus stacking
overhead.
Latency = (Longest instruction execution time + 10) x tcyc seconds
An RTI instruction is used to signify when the interrupt software service
routine is completed. The RTI instruction causes the register contents to
be recovered from the stack and normal processing to resume at the
next instruction that was to be executed when the interrupt took place.
Figure 4-1 shows the sequence of events that occurs during interrupt
processing.
4.4 Reset Interrupt Sequence
The reset function is not in the strictest sense an interrupt; however, it is
acted upon in a similar manner as shown in Figure 4-1. A low-level input
on the RESET pin or an internally generated RST signal causes the
program to vector to its starting address, which is specified by the
contents of memory locations $3FFE and $3FFF. The I bit in the
condition code register is also set. The MCU is configured to a known
state during this type of reset.
4.5 Software Interrupt (SWI)
The SWI is an executable instruction and a nonmaskable interrupt since
it is executed regardless of the state of the I bit in the CCR. If the I bit is
zero (interrupts enabled), the SWI instruction executes after interrupts
that were pending before the SWI was fetched or before interrupts
generated after the SWI was fetched. The interrupt service routine
address is specified by the contents of memory locations $3FFC and
$3FFD.
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For More Information On This Product,
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